辽东湾坳陷南部旅大10-2构造区源盖动态耦合关系定量评价
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摘要
利用钻井、地震资料并结合地化和物性测试等数据,通过盆地数值模拟及数学模型定量计算,对辽东湾坳陷南部辽中南洼沙三段烃源岩的生排烃特征及旅大10-2构造区东二上亚段泥岩盖层的封烃能力演化特征进行了分析,结果表明:辽中南洼深洼区经历了1次相对短期且高效的生排油过程,但此时旅大10-2构造区东二上亚段圈闭尚未形成,所以这次生排油过程对目的层段成藏没有贡献。辽中南洼斜坡带经历了2次生排油高峰,形成2个有利成藏期:第一期为东营组沉积末期,该时期旅大10-2构造区泥岩盖层封烃能力初步形成,烃类聚集规模相对较小;第二期为明化镇组沉积期,此时期与旅大10-2构造区泥岩盖层形成有效封盖的时间相耦合,有利于油气的大量聚集,所以这一时期也是旅大10-2构造区东二上亚段的主成藏期。旅大10-2构造区是寻找晚期来自辽中南洼斜坡带原油的有利目标区。
By using well,seismic,geochemical and petrophysical data and through numerical basin simulation and quantitative calculation of mathematical models,the hydrocarbon generation and expulsion from Sha-3 Member source rocks and the sealing evolution of Upper Dong-2 Member mudstone were analyzed respectively in Liaozhong South sag and in LD10-2 structural zone,the southern Liaodong Bay depression.According to the analytical results,there was a short and efficient stage of hydrocarbon generation and expulsion in the deep area of Liaozhong South sag,which had no contribution to hydrocarbon accumulation in the target intervals due to no traps formed in Upper Dong-2 Member before this stage.In the slope zone of Liaozhong South sag,there were two peaks of hydrocarbon generation and expulsion,resulting in two favorable periods of hydrocarbon accumulation.The first period was simultaneous with the last deposition of Dongying Formation,and its contributed hydrocarbon accumulation was in smaller size due to only initial sealing capacity of the mudstone in LD10-2 structural zone.However,the second period during Minghuazhen Formation deposition was favorable to extensive hydrocarbon accumulation due to its coupling with the effective mudstone sealing in LD10-2 structural zone,and it is the major stage of hydrocarbon accumulation in Upper Dong-2 Member in this structural zone.Therefore,LD10-2 structural zone is a favorable target area for hunting for oil from the slope zone of Liaozhong South sag.
引文
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