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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Besides this, localized sandstone reservoirs within the Cambay Shale as in the Unawa, Linch, Mandhali, Mehsana, Sobhasan, fields, etc are also present. There was a regional southward tilt of the entire bzsin basin during Late Eocene and it is marked by a regional marine transgression extending far to the north upto Sanchor basin. The lithological heterogeneity gave rise to permeability barriers, which facilitated entrapment of hydrocarbons.
Trap Rock Ov most significant factor that controlled the accumulation of hydrocarbons in the Olpad Formation is the favorable lithological change with structural support and short distance migration. This site is best viewed using current versions of Firefox v.
bxsin The same is true for the Tarapur Shale. 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.
The end of Cambay Shale deposition is again marked by the development of a widespread unconformity that is present throughout the basin. The end of the Paleogene witnessed a major tectonic activity in the basin resulting in the development of a widespread unconformity. 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.
A total of more than 30, LKM of conventional data has been acquired.
The end of deposition of the Olpad Formation is marked by a prominent unconformity. More than exploratory wells have been drilled in Cambay Basin. In the north, the basin narrows, but tectonically continues beyond Sanchor to pass into the Barmer Basin of Rajasthan. At places a gradational contact with the overlying Cambay Shale has also been noticed.
In the northern part of the Ahmedabad-Mehsana 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. Shales within the Miocene section in the Broach depression might have also acted as source rocks.
Pliocene was a period of both low and high strands of the sea level, allowing the deposition of sand and shale. Oligocene — Lower Miocene marks another phase of tectonic activity with extensive deposition of coarser clastic sediments in the central and southern blocks. The associated unconformity also helped in the development of secondary porosity. This turned out to be a discovery well, which produced oil and gas. Subsidence of the basin resulted in the accumulation of a thick sequence of euxinic black shales cakbay subordinate coarser clastics.
These sediments are characterised by an assortment of illsorted, high energy trap derived materials. Reservoir Rock There are a number basln the reservoirs within the trapwacke sequence of the Olpad Formation.
Throughout the geological history, except during early syn— rift stagethe North Cambay Geoology received major clastic inputs from north and northeast, fed by the Proto—Sabarmati and Proto—Mahi rivers. Subsequently, there was a strong tectonic activity that resulted in the development of the Mehsana Horst and other structural highs associated with basement faults.
Gradually, the rift valley expanded with time. The end of this sequence is marked by a regressive phase leading to deposition of claystone, sandstone, and shale alternations and a limestone unit of od Dadhar Formation.
Different Tectonic Zones with in the Basin The Cambay rift valley is bounded by well demarcated beology margin step faults. This shale sequence has been divided into Older and Younger Cambay Shale with an unconformity in between.
The Middle Eocene witnessed a regressive phase with oscillating conditions of deposition and development of deltaic sequences in the entire basin.
The NW-SE Dharwarian tectonic trends got rejuvenated creating a narrow rift graben extending from the Arabian sea south of Hazira to beyond Tharad in the north. 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.
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 cambqy rift system.
Cambay Basin | NDR – National Data Repository India
From north to south, the blocks are:. These consist of sand size basalt fragments.
Cambay Basin Basin Introduction: In the following period, relative subsidence of the basin continued leading to the accumulation of the Younger Cambay Shale. During Paleocenethe basin continued to remain as a shallow depression, receiving deposition veology fanglomerate, trap conglomerate, trapwacke and claystone facies, especially, at the basin margin under a fluvio—swampy regime.