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通过对鄂尔多斯盆地南部彬长地区延长组长7层位过剩压力发育,过剩压力影响着长6-长8层位的油气运距方向,过剩压力与油气成藏之间关系密切。通过对泾河等30余口井测井资料的详细分析,根据声波测井资料绘制出,JH55井等30余口彬长地区的泥岩压实曲线图的分析;结合彬长地区的地质背景及压实特征,明晰过剩压力结构及与油藏关系。研究表明:过剩压力为石油运移提供动力条件,彬长地区排烃方向为过剩压力梯度变化大的方向,石油主要向长8段运聚。彬长地区延长组主要发育两种成藏组合,其上形成长7段生、长6段储、长4+5段封盖的中部源内成藏组合;其下形成长7段生、长8段储、长7段封盖的下部源内成藏组合,以此建立鄂南彬长地区成藏模式,为后续的勘探和开发提供部署依据。
Through the development of excess pressure in the 7th layer of the Yanchang Formation in the Binchang area in the southern Ordos Basin, the excess pressure has an effect on the hydrocarbon migration direction in the 6-long-8th layer. The relationship between excess pressure and hydrocarbon accumulation is close. Based on the detailed analysis of logging data of more than 30 wells in Jinghe River, the compaction curves of mudstone of more than 30 wells in Binchang, such as JH55, are plotted based on acoustic logging data. Combining with the geological background of Binchang area and Compaction characteristics, clarify the structure of excess pressure and the relationship with the reservoir. The results show that the excess pressure provides the driving force for oil migration. The direction of hydrocarbon expulsion in Binchang area is the direction of large changes of excess pressure gradient. There are mainly two types of reservoir assemblages in the Yanchang Formation in Binchang area, forming the middle-source accumulation assemblage of Chang 7 segment, Chang 6 segment and Chang 4 + 5 segment. Section reservoir and a long 7-segment cap to form a reservoir-forming pattern in the Binchang area of the southern Ordos Basin, providing a basis for subsequent exploration and development.