The Cambay rift Basin, a rich Petroleum Province of India, is a narrow, .. Throughout the geological history, except during early syn– rift stage, the North. Petroleum Geology of the Cambay Basin, Gujarat., India. Front Cover. L. R. Chowdhary. Indian Petroleum Publishers, – Petroleum – pages. Petroleum geology of the Cambay Basin, Gujarat., India. Responsibility: L.R. Chowdhary. Imprint: Dehradun: Indian Petroleum Publishers, c Physical.
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During Miocene The depocenters continued cxmbay subside resulting in the deposition of enormous thickness of Miocene sediments as the Babaguru, Kand and Jhagadia formations. Besides this, localized sandstone reservoirs within the Cambay Shale as in the Unawa, Linch, Mandhali, Mehsana, Sobhasan, fields, etc are also present.
Geographic Location of the basin The Cambay rift Basin, a rich Petroleum Province of India, is a narrow, elongated rift graben, extending from Baasin in the south to Sanchor in the north. Seismic and drilled well data indicate a thickness of about 8 km of Tertiary sediments resting over the Deccan volcanics.
The associated unconformity also helped in the development of secondary porosity. The NW-SE Dharwarian tectonic trends got rejuvenated creating a narrow rift graben extending from geoligy Arabian sea south of Hazira to beyond Tharad in the north.
Subsequently, there was a strong tectonic activity that resulted in the development of the Mehsana Horst and other structural highs associated with basement faults.
Petroleum geology of the Cambay Basin, Gujarat., India in SearchWorks catalog
These consist of sand size basalt fragments. During Pleistocene to Recent, the sedimentation was mainly of fluvial type represented by characteristic deposits of coarse sands, gravel, clays and kankar followed by finer sands and clays, comprising Gujarat Alluvium.
Gradually, the rift valley expanded with time. The end of the Paleogene witnessed a major tectonic activity in the basin resulting in the development of a widespread unconformity. The Early Tertiary sediments ranging in age from Paleocene to Early Eocene represent syn-rift stage of deposition that was controlled by faults and basement highs in an expanding rift system. The total volume of seismic reflection data acquired from the Cambay Basin is of the order of LKM 2D and sq.
Based on the cross trends the basin has been divided into five tectonic blocks. Pliocene was a period of both low and high strands of the sea level, allowing the deposition of sand and shale. Cambay Basin Basin Introduction: During Paleocenethe basin continued to remain as a shallow depression, receiving deposition of fanglomerate, trap conglomerate, trapwacke and claystone facies, especially, at od basin margin under a fluvio—swampy regime.
Trap Rock The most significant factor that controlled the accumulation of basih in the Olpad Formation is the favorable lithological change oof structural support and short distance migration. The lithological heterogeneity gave rise to permeability barriers, which facilitated entrapment of hydrocarbons. In the north, the basin narrows, but tectonically continues beyond Sanchor to pass into the Barmer Basin of Rajasthan. In the northern part of the Ahmedabad-Mehsana Block, coal, which is well developed bbasin the deltaic sequence in Kalol, Sobhasan and Mehsana fields, is also inferred to be an important hydrocarbon source rock.
The end of deposition of the Olpad Formation is marked by a prominent unconformity. These sediments are characterised by an assortment of illsorted, high energy trap derived materials. In the following period, relative subsidence of the basin continued leading to the accumulation of the Younger Cambay Shale.
Absin places a gradational contact with the overlying Cambay Shale has also been noticed. This turned out to be a discovery well, which produced oil and gas. This site is best viewed using current versions of Firefox v.
Out of prospects drilled, 97 are oil and basih bearing. Shales within the Miocene section in the Broach depression might have also acted as source rocks. During Early Eocenea conspicuous and widespread transgression resulted in the deposition of a thick, dark grey, fissile pyritiferous shale sequence, known as the Cambay Shale. A total of more than 30, LKM of conventional data has been acquired.
Cambay Basin | NDR – National Data Repository India
More than exploratory wells have been drilled in Cambay Basin. Subsidence of the basin resulted in the accumulation of a thick sequence of euxinic black shales with subordinate coarser clastics. The magnetic anomaly map also depicts the broad structural configuration of the basin. Throughout the geological history, except during early syn— rift stagethe North Cambay Basin received major clastic inputs from north and northeast, fed by the Proto—Sabarmati and Proto—Mahi rivers.
Oligocene — Lower Miocene marks another phase of tectonic activity with extensive deposition of coarser clastic sediments in the central and southern blocks. This shale sequence has been divided into Older and Younger Cambay Shale geplogy an unconformity in between. The same is true for the Tarapur Shale.
There was a regional southward tilt of the entire rift basin during Late Eocene and it is marked by a regional marine transgression extending far to the north upto Sanchor basin. The end of Cambay Shale deposition is again marked cammbay the development of a widespread unconformity that is present throughout the basin.
The Middle Eocene witnessed a regressive phase with oscillating conditions of deposition and development of deltaic sequences in the entire basin. Similarly, the Proto—Narmada river system was active in the geoloby, supplying sediments from provenance, lying to the east.