Polygonal faults in the Sanzhao sag of the Songliao basin:their significance in hydrocarbon accumulation  

作　　者：HE, Chunbo  TANG, Liangjie  HUANG, Deli  SHI, Shangming 

机构地区：[1]state key laboratory of petroleum resources and prospecting,china university of petroleum,beijing 102249,china basin and reservoir research center,faculty of natural resources & information technology [2]oil recovery plant no.8,daqing oilfield corp.ltd.,daqing 163514,china [3]faculty of earth science,daqing petroleum institute,daqing 163318,china

出　　处：《Mining Science and Technology》2010年第2期300-305,共6页矿业科学技术（英文版）

基　　金：the National Natural Science Foundation of China (No.40672143);the National Basic Research Program of China (No.2005CB 4221007)

摘　　要：Polygonal faults,generally distributed in fine-grained sediments,are layer-bound faults and are important in hydrocarbon accumulation.Using 3D seismic data,we analyzed the plane and profile features of faults developed in the Qingshankou formation of the Sanzhao sag.We identified these faults as having typical features of polygonal faults:1) layer-bound;2) normal faults;3) slight fault displacements and steep in dip angles;4) multi-directional in strike and 5) a single fault has a short horizontal extension.In addition,these faults intersect each other and form polygons.These polygonal faults are the result from the combined action of compaction,volume contraction and episodic hydraulic fracturing,conditions favorable for oil/gas accumulation.They are the dominant channels for migration of fluids in the Qingshankou mudstone,forming a large number of fault-lithologic oil traps.Polygonal faults improve reservoirs.Polygonal faults,generally distributed in fine-grained sediments,are layer-bound faults and are important in hydrocarbon accumulation.Using 3D seismic data,we analyzed the plane and profile features of faults developed in the Qingshankou formation of the Sanzhao sag.We identified these faults as having typical features of polygonal faults:1) layer-bound;2) normal faults;3) slight fault displacements and steep in dip angles;4) multi-directional in strike and 5) a single fault has a short horizontal extension.In addition,these faults intersect each other and form polygons.These polygonal faults are the result from the combined action of compaction,volume contraction and episodic hydraulic fracturing,conditions favorable for oil/gas accumulation.They are the dominant channels for migration of fluids in the Qingshankou mudstone,forming a large number of fault-lithologic oil traps.Polygonal faults improve reservoirs.

关 键 词：polygnal faults geometric characteristics fluid expulsion COMPARTMENT Sanzhao sag 

分 类 号：TD8[矿业工程—矿山开采]