G as accumulations and distribution features in the south of the Changling fault depression in the Songliao Basin

doi:10.11743/ogg20100317

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G as accumulations and distribution features in the south of the Changling fault depression in the Songliao Basin
Vol. 31, Issue 3, Pages: 381-385(2010)
Online First：24 August 2010，

Published：2010
DOI： 10.11743/ogg20100317
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DOI：

G as accumulations and distribution features in the south of the Changling fault depression in the Songliao Basin[J]. 2010, 31(3): 381-385. DOI： 10.11743/ogg20100317.

摘要

松辽盆地长岭断陷南部发育有营城组、沙河子组和火石岭组3套烃源岩，其中沙河子组泥岩有机质丰度高，为区内主力烃源岩。沙河子组主要分布在分割性较强的独立次凹中，生烃凹陷控制了天然气藏的分布，生烃潜力的大小控制了气藏的充满度。该区天然气具有多期充注成藏特点，后期存在二氧化碳气体的充注。天然气的有利富集带位于邻近生烃凹陷的前排构造和岩性圈闭发育带。

Abstract

Three sets of source rocks，namely the Yingcheng Formation，Shahezi Formation，and Huoshiling Forˉmation，occur in the south of the Changling faultdepression in the Songliao Basin.Among them，the ShaheziForˉmation shale with high TOC is considered to be themajor source rocks in the area.It ismainly distributed in inˉdependent subˉsag being strongly compartmentalized.The hydrocarbon kitchen controls the distribution of gas reservoirs and the hydrocarbonˉgeneration potential controls the fullness of gas reservoirs.Gas reservoirs in the area feature in multiˉstage hydrocarbon charging and late carbon dioxide charging.It is suggested that the front row structures and lithological traps near the hydrocarbon kitchen are the potential targets for gas exploration.