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Patterns And The Prediction For Oil/Gas Accumulation Of Subtle Traps In The Erlian Basin

Posted on:2006-03-09Degree:DoctorType:Dissertation
Country:ChinaCandidate:H B LiangFull Text:PDF
GTID:1100360155464474Subject:Structural geology
Abstract/Summary:PDF Full Text Request
The Erlian Basin is a Mesozoic rift-subsidence basin developed on the basis of Inner-Mongolia and Daxinganling Hercynian fold belt. The basin consists of a series of rift-subsidence depressions including Manite, Wunite, Tengge'er, Wulanchabu and Chuanjing. The source beds and oil horizons of these depressions belong to lower Cretaceous. Each depression, with independent depositional systems, is relatively independent for hydrocarbon formation, migration and accumulation. Based on the studies on geologic conditions, migration and accumulation for subtle traps in The Erlian Basin, the accumulation pattern of different subtle traps is established, then study methods and prediction techniques forexploration of subtle traps were put forward.The main knowledge and conclusions are as follows. The depressions are abundant resources provided by two sets of source beds of Cretaceous with favorable structure background of interchanged uplifts and sags, and great amounts of sand bodies formed under special sedimentation conditions of multi-sources, near-sources and narrow-sedimentary face belts. According to origination of traps, subtle oil reservoirs in Erlian basin can be divided into lithologic, stratigraphic and multiple three types. Most of the subtle oil reservoirs are under a uniform temperature and pressure system. They mainly developed along the maximum lacustrine flood surfaces, unconformity planes and fault planes. In space distribution, they are mainly controlled by sedimentation systems in horizontal and concentrated in primary or secondary pore developing belts in vertical. Different sags have different structural features and thus can form different types of subtle oil reservoirs.Three kinds of oil accumulation patterns of subtle traps, including steep slope, slow slope and trough belts, are established in this paper. Different kinds of typical subtle oil reservoirs are identified and predicted. And also research methods and techniques for subtle oil reservoir suitable in the Erlian basin are put forward.
Keywords/Search Tags:Sag evaluation, sedimentation system, oil/gas accumulation pattern, identification and prediction, methods and techniques
PDF Full Text Request
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