东濮凹陷沙一段自生油气藏成藏条件及成藏模式

通过对东濮凹陷沙一段构造演化及烃源岩研究发现,沙一段暗色泥岩在区内分布稳定,为较好—好的烃源岩,晚期深埋使前梨园、海通集、孟岗集洼陷中心附近烃源岩成熟,具备较好的生烃条件,埋藏史研究显示沙一段成藏期为明化镇沉积期—现今。通过对刘庄自生自储型油藏的油源特征、储盖特征、油气运聚及油藏类型解剖,明确了刘庄沙一段油气藏成藏过程。建立了东濮凹陷沙一段自生自储型油气藏成藏模式：近源成藏,断砂双控,高点富集,油藏规模小、数量多。研究成果对东濮凹陷前梨园—海通集—孟岗集地区沙一段油气勘探具有重要意义。

Accumulation condition and mode of autogeny hydrocarbon reservoir for the first member of Shahejie Formation in Dongpu Depression

Through studying the structural evolution and source rock for the first member of Shahejie Formation in Dongpu Depression,it is found that the grey mudstones are not only stable distribution in this region,but also are good hydrocarbon source rocks.The source rocks near the center of Qianliyuan Sag,Haitongji Sag aned Menggangji Sag become mature with the increase of buried depth in Neogene,having good hydrocarbon-generating condition.Study on the burial history of the first member of Shahjie Formation shows that accumulation stages is Minghuazhen depositional stage to today.The accumulation process of autogeny reservoir for the first member of Shahejie Formation in Liuzhuang is defined through studying oil and source rock correlation,reservoir and cap rock,oil and gas migration and accumulation and reservoir type.Accumulation modes of autogeny hydrocarbon reservoir are established,which are proximal accumulation,broken-sand double controlling and high position enrichment.Reservoir scale is small,but quantity is large.This achievement is important to oil-gas exploration of the first member of Shahejie Formation in Qianliyuan Sag,Haitongji Sag and Menggangji Sag in Dongpu Depression.