松辽盆地扶新隆起带南部青山口组超压特征及油气地质意义

发布时间：2018-04-10 13:49

本文选题：超压成因 + 超压分布　；参考：《天然气地球科学》2017年07期

【摘要】：扶新隆起带南部青山口组普遍发育超压,超压与源下油气成藏关系密切。根据录井、钻测井及室内分析测试等资料,结合沉积埋藏史及生烃史,对该区青山口组超压成因、分布及控制因素进行了研究。结果表明:青山口组超压主要分布在青一段、青二段,"层控"效应明显,超压层测井响应具高声波时差、低密度、低电阻率的特征;下斜坡区超压为欠压实作用与干酪根生烃作用综合作用的结果,属二元成因型超压,而上斜坡区超压则以欠压实作用为主导,属单一成因型超压;单井压力剖面呈钟形,自上而下,压力系数与剩余压力均呈递增性变化;纵向上,青二段压力系数为1.2~1.65,剩余压力为2.5~9MPa,表现为低—中超压,青一段压力系数为1.5~1.85,剩余压力为4.5~11MPa,表现为中—高超压,超压极值分布在青一段;平面上,自长岭凹陷至扶新隆起带方向,随着埋深变浅,超压强度减弱,下斜坡区超压明显高于上斜坡区,剩余压力高值中心主要集中在R48井、R39井及R26-1井等井区;青山口组超压分布呈现较强的非均质性,这种非均质性主要受沉积埋藏速率、暗色泥岩厚度及品质、超压层埋深和断层启闭性等因素控制。超压特征研究可为扶新隆起带南部扶余油层油气成藏认识、盖层封闭性能评价等提供依据。
[Abstract]:The Qingshankou formation in the south of Fuxin uplift belt is generally overpressure, which is closely related to oil and gas accumulation under the source.Based on the data of logging, drilling logging and laboratory analysis, combined with the history of sedimentary burial and hydrocarbon generation, the causes, distribution and controlling factors of overpressure in Qingshankou formation were studied.The results show that the overpressure of Qingshankou formation is mainly distributed in the first member of Qingyi formation, and the "layer control" effect is obvious. The response of overpressure reservoir is characterized by high sonic time difference, low density and low resistivity.The overpressure in the lower slope is the result of the combination of undercompaction and kerogen hydrocarbon generation. The overpressure in the upper slope is dominated by the undercompaction and belongs to the single genetic overpressure, and the pressure profile of the single well is bell-shaped.In the plane, from Changling depression to Fuxin uplift zone, the overpressure in the lower slope is obviously higher than that in the upper slope with the shallow burying depth and the weakening of the overpressure intensity.The high value center of residual pressure is mainly concentrated in the well areas of well R48, well R39 and well R26-1, and the overpressure distribution of Qingshankou formation shows strong heterogeneity, which is mainly affected by the burial rate of deposition, the thickness and quality of dark mudstone, and so on.The buried depth of overpressure layer and fault opening and closing are controlled.The study of overpressure characteristics can provide a basis for the understanding of oil and gas accumulation in Fuyu reservoir in the south of Fuxin uplift belt and the evaluation of sealing performance of caprock.
【作者单位】：中国石油大学(华东)地球科学与技术学院;山东省油藏地质重点实验室;
【基金】：国家科技重大专项(编号:2017ZX05009-001) 中央高校基本科研业务费专项资金(编号:15CX06012A)联合资助
【分类号】：P618.13

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