Relationship of Fault with Hydrocarbon Migration and Accumulation in Longfengshan Area, Changling Faulted Depression
Fan Jie
Jiang Youlu
Liu Jingdong
Zhu Jianfeng
Chen Xingxia
Abstract：Reservoirs in Longfengshan area are characterized by "other-source,generation in lower part,storage and accumulation in the upper part".It faclitates the hydrocarbon exploration by determining the fault control to hydrocarbon migration and accumulation.Based on precise illustration of the static characteristics of faults,fault activity,sealing capacity and faultcaprock configuration are evaluated quantitatively in this study.In addition,a method of SGR (Shale Gouge Ratio) lower limit for assessing fault-caprock configuration effectiveness is proposed.Combined with hydrocarbon distribution,the controlling effect on the differential accumulation of hydrocarbon is discussed.The study shows that hydrocarbon can migrate vertically through faults on a large scale at the early and middle stages of the first accumulation period.At the end of the first and the second accumulation periods,sealing corridor space formed by two faults is the main hydrocarbon accumulation site.Application of the SGR lower limit method indicates that fault-caprock configuration of K1yc3 is good enough to provide favourable conditions for hydrocarbon conservation.Consequently,the effect of faults controlling on hydrocarbon migration and accumulation can be summarized into following three aspects.This is fault activity controls the hydrocarbon vertical migration scale in different stages;fault sealing capacity controls the horizontal enrichment degree of hydrocarbon,and fault-caprock configuration controls petroliferous reservoir.
Keywords：fault activityfault sealing capacityfault-caprock configurationhydrocarbon migration and accumulationLongfengshan areaChangling faulted depressionpetroleum geology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 1817-1829 )