松辽盆地断陷层系大、中型油气田形成条件及勘探方向

doi:10.11743/ogg20060613

Abstract

Abstract:

Middle and large oil/gas fields are largely distributed in the deep fault depressions along the two sides of NNE Sunwu-shuangliao lithosphere fault crossing the central part of Songliao basin.These fault depressions has favorable geological conditions for hydrocarbon reservoiring.First,very thick source rocks were deposited in the inherited large abyssal-hypabyssal lakes caused by constant and quick subsidence of the fault depression and the surrounding depressions'blockade of the large proveniences on basin edge. Secondly,two types of reservoir rocks-volcanics and sandstone-were formed when a severe strike slip extensional movement happened in early-middle Yanshan period and caused the development of lacustrine facies mudstone with volcanic rocks and detrital rocks interbedded.Thirdly,after the formation of fault depression,the continuous quick subsidence,together with the lacustrine facies mudstone and shale sequences with abnormal pressure in drape depression,forced the source rocks go through thermal evolution and hydrocarbon generation and shaped the cap rocks into favorable sealing material for natural gas in the depressions.Fourthly,as the depressions experienced stable subsidence with no severe lifting in the later period,well-preserved regional cap rocks provide favorable preservation condition for gas reservoirs.Finally,much less activities of basal deep faults in the Late Cretaceous induced less destruction to the gas reservoirs. A study on the accumulation pattern in deep fault depressions shows that middle and large oil/gas fields are mainly distributed in the inherited latitudinally trending nose-like structure,stratigraphic overlapping pinch out traps,and complex lithological traps,among them the uplift zone between two deep fault depressions is where the largest oil/gas fields are distributed.

Key words: fault depressions,hydrocarbon enrichment zone, middle-and large-scale oil/gas fields, exploration target, Songliao basin

CLC Number:

TE112.3

Zhou Liqing, Lei Yixin. Formation conditions for middle and large oil/gas fields in rift sequences of Songliao basin and thear future exploration targets[J]. Oil & Gas Geology, 2006, 27(6): 820-826,840.

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Formation conditions for middle and large oil/gas fields in rift sequences of Songliao basin and thear future exploration targets

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