摘要
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。
Overpressure occurs in Chang 7 horizon of Yanchang Formation in the Binchang region of south Ordos basin and it affects the direction and digtance of oil migration in the Chang 6 and Chang 8 horizons. Therefore,it is important to understand the relation between the overpressure and oil ＆ gas accumulation. PCOE is calculated by using the acoustic logging data and compaction curves for 30 siltstone wells are protracted so as to analyze the relationship between compaction features. It shows that overpressure serves as the important power for the oil primary migration. For excess pressure gradient in the direction of hydrocarbon expulsion changes the direction of migration toward the direction of pressure increment,in fact, to the direction of Chang 8 horizon. Two main types of reservoir combinations occur in the Binchang region, one is the mid part reservoir in which the Chang 7 Member is the oil ＆ gas formation horizon,Chang 6 Member is the oil ＆ gas accumulation horizon,and the Chang 4 and Chang 5 Members are the cap horizon; the other is the low part reservoir in which the Chang 7 Member is the oil＆ gas formation horizon,Chang 8 Member is the oil ＆ gas accumulation horizon,and the Chang 7 Member is the cap horizon.
出处
《矿物岩石》
CAS
CSCD
北大核心
2015年第2期98-106,共9页
Mineralogy and Petrology
基金
国家科技重大专项"大牛地气田开发地质特征研究"(2011ZX05045-01-02)
