Subaerial denudational, fluviatile, aeolian and marine processes have produced the recent deposits that cover the cambay basin. The purpose of the cambay basin petroleum project is to assist the oil and natural gas commission ongc in developing its capabilities for optimizing the production of existing, mature oil fields, a new area of technology for indias fledgling oil industry. This article is published with open access at abstract shale formations have laminated structures with. A schematic, west to east geological crosssection across north cambay basin is shown approximate location of the section through ahmedabad and mehsana blocks is shown in fig. Early eocene equatorial vegetation and depositional. The formation of the cambay basin began following the extensive outpour of deccan basalts deccan trap during late cretaceous covering large tracts of western and central india.
Mineralogical and morphological characterization of older cambay. Black cotton soils, lateritic soils and sandy loams, flood plain deposits, levees, swamps, salt waste, barrier spits, sand hills, undulating. Jun 11, 2019 the key fields in the cambay basin are ankleshwar, kalol, sobhasan and gandhar. Major lineaments in this block trend in the nnw sse direction. India cambay basin petroleum project ingles banco mundial. The deeper offshore saurashtra borders with the indus. However, the southern part of the basin, where more than 1,000 m of cretaceous sediments were deposited by two independent drainage systems, may be more lucrative. Mineralogical assemblage of cambay shale of north cambay basin. The cambay basin, located between the kathiawar horst subpeninsula in the west and the main indian shield in the east, extends from north 2427. Broadband and longperiod magnetotelluric data were acquired over the northern part of the cambay rift zone along an eastwest profile 200 km in length. Basin information directorate general of hydrocarbons dgh. It is based on the subsurface study of on oil field in cambay basin.
Subsurface understanding of an oil field in cambay basin. In some parts of the basin, some reflections in the seismograms obtained in the course of seismic surveys, could be correlated to the trap surface. Pdf shale oil exploration from paleoceneearly eocene. Upper part of cambay shale formation containing siltstone was also targeted whereas the lower part which dominantly consists of shale was never thought to be a reservoir. In the southern cambay basin, it was sourced from a higher plant fraction deposited in marine or fluvial deltaic environment sivan et al. It extends from sanchor in north to the gulf of cambay in south and opens into the arabian sea. The cambay rift basin in northwestern india is one of the three basins that originated between the early jurassic and tertiary, during indias drift after the. The present study is an attempt to understand the mineralogical characteristics of one of the prominent shale basins i. The broach sub block lies between the mahisagar and narmada rivers of south cambay basin, gujarat india.
The effective source rocks in the north cambay basin, india. Study of cambay and krishnagodavari basin for shale oil. A case for revisiting the evolutionary history of pericratonic cambay basin, india. Fracture ability of the shale formations from of the part cambay basin was investigated from its mineralogy and morphology. India cambay basin petroleum project english the world bank. The decomposed te and tmmode data were inverted using a 2d nonlinear conjugate gradient algorithm to obtain the lithospheric structure of the region. Evaluation of cambay shale cambay basin, india using geomechanical properties, journal of petroleum exploration and production technology, 20, pp. The basin assumes great importance in petroleum exploration owing to the presence of thick hydrocarbon bearing sedimentary rocks. Twodimensional velocity model of the crust beneath the south. The discovery of the barmer basin, rajasthan, india, and its. Pdf identification of hydrocarbon microseepage using trace. Aug 20, 2019 in the southern cambay basin, it was sourced from a higher plant fraction deposited in marine or fluvial deltaic environment sivan et al.
An attempt has been made to determine shalegas prospectivity of cambay shale integrating wireline log, mud log, cutting and core data. The effective source rocks in the north cambay basin. The discovery of hydrocarbon in few wells in cambay basin in early 2000 changed the paradigm of exploration strategy in cambay basin. Bombay province cambay basin the cambay basin began as a failed rift in the late cretaceous during which time. Saurashtra basin directorate general of hydrocarbons.
Mapping of iodine, lithium and strontium in oilfield water. The current study deals with the cambay basin where silty sand reservoir has been identified as hydrocarbon bearing. Mapping of iodine, lithium and strontium in oilfield water of. Scientific research outcome report reservoir characterization of cambay shale cambay basin, india in reference to shale gas exploration and exploitation. Broadband and longperiod magnetotelluric data were acquired over the northern part of the cambay rift zone along an eastwest profile 200. After a brief description of the cambay basins geology, the other aspects of exploration were. Above the deccan trap, separated by the olpad formation, is the late paleocene and. New evidence for a thin crust and magmatic underplating.
Cretaceous sediments which underlie the deccan traps are exposed in the eastern and western margins of the basin and are also encountered in the subsurface. On the west and east, it is bounded by basin margin. The early tertiary sediments ranging in age from paleocene to early eocene represent synrift stage of deposition that was controlled by faults and basement highs in an expanding rift system. Pdf the effective source rocks in the cambay basin, india.
The cambay basin is a narrow elongated rift graben situated between saurashtra craton on the west and aravalli on the northeast and deccan craton to the southeast. Cambay basin is contributing almost onethird of indias total onshore oil production. The basin is divided into five tectonic blocks separated by major cross trends. Brittleness modeling of cambay shale formation for shale. Reservoir nature and evaluation of deccan trap basement, cambay basin, india ashok kumar well logging services, western onshore basin, ongc ltd. The cambay rift basin crb is an intracratonic rift in the western part of india. The lower tapi basin extends over an area of 2920 sq. Now established as early eocene in age sahni et al. Subsurface understanding of an oil field in cambay basin 2. Cambay basin in gujarat holds 206 bcf gas in one zone. Volume iii, issue v, may 2014 ijltemas issn 2278 2540 sources and measurement of velocity anisotropy of cambay shale, cambay basin, india anil. The basin has traditionally been more oilprone than gasprone.
Reservoir nature and evaluation of deccan trap basement. Source rock screening reveals five laterally extending potential sources ps in the paleogene. India cambay basin petroleum project ingles resumo. After a brief description of the cambay basin s geology, the other aspects of exploration were. Reservoir characterization case study, cambay basin, india. Dholka is one of the complex oil field in cambay tarapur tectonic block wherein gas has been struck, for the first time, in shale reservoir of middle eocene. The town of khambat cambay in presentday gujarat was its capital. The magnetic anomaly map also depicts the broad structural configuration of the basin. Identification and evaluation of hydrocarbon accumulation in unconventional reservoir a case study from cambay basin in india jai prakash narayan, sarvesh mallik and birbal singh logging group, kdmipe, kaulagarh road, dehradun248195 email. Aerially, this is the lasrgest block in the basin, extending from dholka. Evaluation of cambay shale cambay basin, india using geomechanical properties.
The gulf of khambhat is about 200 km 120 mi long, about 20 km 12 mi wide in the north and up to 70 km 43 mi wide in the south. Cambay basin is a narrow, nnwsse trending intracratonic rift basin, formed at the end of cretaceous which is located on western margin of the indian shield fig. The stratigraphic sequence encountered in this well is given in table 2. The discovery of oil and gas in the barmer basin in northwest india was one of the more significant global discoveries in the decade 20012010. The study area falls in the sanchorpatan tectonic block in the northern part. The upper paleocene to middle eocene cambay shale was evaluated for shale oil, and the paleocene olpad formation was evaluated for tight sandstone gas.
Abstract cambay is matured petroliferous basin in the western part of india. Hydrocarbon prospectivity in stratigraphic traps within cambay. The state was bounded in the north by the kaira district and in the south by the gulf of cambay. In the attempt to study the buried deccan trap layers in the cambay basin, the ground magnetic surveys have not been very useful as the data combine the effect due to the crystalline basement and the trap thickness. The graben is divided into four blocks, ranging from north to south as ahmedabadmehsana, tarapur, broachjambusar and narmada mathur et al. The pss are sr5 and sr6 in dominantly marine early eocene to late paleocene cambay shale formation, and sr7, sr89, and sr1112 in dominantly freshwater early paleocene olpad formation. In this study, samples of the cambay shale from four wells and two opencast coal mines were examined. The subject well is a recently drilled and completed in cambay field offshore in west coast of india. The deccan trap, composed of horizontal lava flows, forms the basement of the cambay basin. Gas shale potential of cambay formation, cambay basin, india. Complete report in english official version of document may contain signatures, etc official pdf, 30 pages 1. Reservoir characterization case study, cambay basin, india priyabrata chatterjee, anil malkani, abajyoti boruah, ikhilesh dwivedi and peter hansen summary the cbos2 block in the cambay basin is located offshore west india in the gulf of khambat figure 1. Evaluation of cambay shale cambay basin, india using geomechanical properties priti r.
Relationship of the cambay rift basin to the deccan volcanism. Division of essar oil limited to cambay basin, a proven. Previous investigations using deep seismic soundings dss, gravity and heat flow data reveal that the crb is characterised by a thin crust, high heat flow and high density lower. The effective source rocks in the cambay basin, india. Cambay basin is bounded on its eastern and western sides by basin margin faults and extends south into the offshore gulf of cambay, limiting its onshore area to 7,900 mi2. Ahmedabadmehsana tectonic block this block lies between the khari river in the north and the vatrak river in the south. It offers low fullcycle breakeven prices and high returns, thanks to an extensive network of infrastructure and a focus on nearfield exploration. Raising production from cambay basin is a considerable challenge as major producing fields are all brownfields. The cambay basin is a tertiary intracratonic graben in the western onshore part of india. The purpose of the cambay basin petroleum project is to assist the oil and natural gas commission ongc in developing its capabilities for optimizing the production of existing, mature oil fields, a new. The cambay basin in the nw part of the indian peninsula is a commercial petroleum producer from tertiary sediments resting on the basic lava flows known as deccan traps. Jan 23, 2019 in the southern cambay basin, it was sourced from a higher plant fraction deposited in marine or fluvial deltaic environment sivan et al. Tectonosedimentary evolution of northern part of cambay basin tusar ranjan sahoo1 and mainak choudhuri2.
Shale oil exploration from paleoceneearly eocene sequence in cambay rift basin, india. The quaternary geology of the cambay basin is studied with the help of aerial photographs and spot checking in the field. The basins origins are related to the northward movement of the indian subcontinent after the breakup of the gondwanaland. The basins presence was suspected from gravity and magnetic data in the late 1980s but not confirmed until 1999 from seismic and drilling.
India cambay exploration basin report wood mackenzie. Tectonosedimentary evolution of northern part of cambay basin. Mineralogical and morphological characterization of older. Formation evaluation of fractured basement, cambay basin. Downloaded 040819 redistribution subject to seg license or. Evaluation of cambay shale cambay basin, india using geo. Geology of cambay basin pdf the cambay rift basin, a rich petroleum province of india, is a narrow, throughout the geological history, except during early syn rift stage, the. Gas shale potential of cambay formation, cambay basin, india somen mishra1 and b. Understanding basement fracture architecture in padra field, south. Geoelectric structure of northern cambay rift basin from. The cambay basin is an intracratonic basin located along the western continental passive margin of indian. Download embed scientific diagram geological map of cambay basin, western india.
The state was bounded in the north by the kaira district and in the south by the gulf of cambay cambay was the only state in the kaira agency of the gujarat division of the bombay presidency, which merged into the baroda and gujarat states agency in 1937. Different tectonic zones with in the basin the cambay rift valley is bounded by well demarcated basin margin step faults. The formation of the cambay basin began following the extensive outpour of deccan basalts deccan trap during late cretaceous. The basin, around 425 km long with an average width of about 8 km, extends from luni river in the north to tapti. The length of the tapi river in lower tapi basin is 129 km. The key fields in the cambay basin are ankleshwar, kalol, sobhasan and gandhar. Mehsana block aligned anklesvar field anklesvar formation api gravity banerjee and rao basalts basement broachjambusar block cambay shale cambay tarapur block chandra and chowdhary chowdhary 1969 clastics claystone coal coarse clastic cretaceous crude oil. Tectonosedimentary evolution of northern part of cambay.
Lower tapi basin consists of main tapi stream from ukai reservoir to its mouth in the gulf of cambay. After landing the completion, two mechanical plugs were installed to nipple down bop and nipple up xmas tree. Study of the deccan traps of cambay basin by geophysical. Gas strike in shale reservoir in dholka field in cambay basin. World petroleum resources project assessment of potential. The onland part of the basin borders with the commercially proven. The eocene cambay shale is the principal source rock for conventional hydrocarbons and a prime target for tight gastight oil exploration in the cambay basin western india. In the north, the basin narrows, but tectonically continues beyond sanchor to pass into the barmer basin of rajasthan. Formation evaluation of fractured basement, cambay basin, india article pdf available in journal of geophysics and engineering 92.
Stanford libraries official online search tool for books, media, journals, databases, government documents and more. Geographic location of the basin the cambay rift basin, a rich petroleum province of india, is a narrow, elongated rift graben, extending from surat in the south to sanchor in the north. Pdf the effective source rocks in the north cambay basin, india. Pdf outcrop study in south cambay basin, india researchgate. The basin, located in the western states of india, has been actively explored since 1960 with production started in 1961 by ongc. In the northern part of the ahmedabadmehsana block, coal, which is well developed within the deltaic sequence in kalol, sobhasan and mehsana fields, is also inferred to be an important hydrocarbon source rock. Source potential and reservoir fabric of the cambay shale. The gulf of khambhat, also known as the gulf of cambay, is a bay on the arabian sea coast of india, bordering the state of gujarat. Cambay, kambay or khambhat, was a princely state during the british raj. Hydraulic fracturing hf is in use since 1980s to stimulate and enhance production from average to poor quality sands of cambay basin.
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