鄂尔多斯盆地杭锦旗地区不整合结构类型及运移特征

doi:10.11743/ogg20160203

Abstract

Abstract: Hangjinqi Block is located in northern Ordos Basin and has three unconformities including the Upper Paleozoic-Lower Paleozoic, Upper Paleozoic-Paleozoic and Upper Paleozoic-Archean.Logging data, core data and cutting logging data were integrated to study the characteristics of unconformity space structure in detail.In addition, hydrocarbon migration characteristics of various types of unconformity structure were also analyzed in combination with the carriers above and below the conformities and distribution of gas reservoir.It also figured out the distribution area of advantageous migration pathways.The research shows that there are nine unconformity configuration types in Hangjinqi Block, namely sand-mud-sand, sand-mud-limestone, sand-mud-metamorphic rock, sand-metamorphic rock, sand-limestone, mud-mud-sand, mud-mud-limestone, mud-mud-metamorphic rock and sand-mud-mud.And there are three kinds of migration pathways, namely double migration pathway I-type, single migration pathway Ⅱ₁-type and single migration pathway Ⅱ₂-type, among which the double migration pathway I-type is the primary pathway and is mainly distributed in three areas.The largest area is in the central-eastern part of the block, and its target traps are Shilijiahan in the south of fault and ShiguhaoYin the north of fault.And the second area lies in the western block and its target trap is Xinzhao.The smallest area lies in the eastern block and its target trap is Azhen.Double migration pathway is poorly developed in Shilijiahan trap and is favorable for the in-situ enrichement and accumulation of gas.

Key words: migration pathway type, unconformity structure type, Hangjinqi area, Ordos Basin

CLC Number:

TE121.2

Sun Xiao, Li Liang, Ding Chao. Unconformity structure types and hydrocarbon migration characteristics in Hangjinqi area of Ordos Basin[J]. Oil & Gas Geology, 2016, 37(2): 165-172.

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Unconformity structure types and hydrocarbon migration characteristics in Hangjinqi area of Ordos Basin

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