应用定量颗粒荧光技术分析红河油田延长组油气输导机制及运聚规律  

Application of quantitative grain fluorescence techniques to investigating transport mechanisms and rules of hydrocarbon migration and accumulation in the Yanchang Formation of Honghe Oilfield

作　　者：贾京坤[1,2] 王梓媛[3] 尹伟[4] 潘懋[3] 师永民[3] 佟颖[5] 黄胜玉 JIA Jingkun;WANG Ziyuan;YIN Wei;PAN Mao;SHI Yongmin;TONG Ying;HUANG Shengyu(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum（Beijing）,Beijing City,102249,China;College of Geosciences,China University of Petroleum（Beijing）,Beijing City,102249,China;School ofEarth and Space Sciences,Peking University,Beijing City,100871,China;Petroleum Exploration ＆ ProductionResearch Institute,SINOPEC,Beijing City,100083,China;Research Institute of Petroleum EngineeringTechnology,SINOPEC,Beijing City,100101,China;No.8 Oil Production Plant,PetroChinaChangqing Oilfield Company,Xi’an City,Shaanxi Province,710018,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]北京大学地球与空间科学学院,北京100871 [4]中国石化石油勘探开发研究院,北京100083 [5]中国石化石油工程技术研究院,北京100101 [6]中国石油长庆油田分公司第八采油厂,陕西西安710018

出　　处：《油气地质与采收率》2018年第4期7-15,共9页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"中西部重点碎屑岩层系油气富集规律与勘探方向"(2016ZX05002-006)

摘　　要：鄂尔多斯盆地西南缘红河油田延长组油气运聚规律不明确,制约了进一步的油气勘探。综合地质、气测录井、测井数据以及定量颗粒荧光技术分析结果,推导出在致密砂岩条件下油气沿断裂向下输导的压力衰降梯度模型,进而对红河油田延长组油气输导机制进行研究,剖析油气运聚规律。研究结果表明:油气沿断层向下输导的压力衰降梯度为(0.028±0.01) MPa/m,沿裂缝向下输导的压力衰降梯度约为0.24 MPa/m;油气先沿裂缝垂向输导、再沿断层垂向输导的运移接力的压力衰降梯度为0.14~0.18 MPa/m。在早白垩世晚期,研究区油气主要来自长7段主力烃源岩,在异常高压的驱动下,沿断层破裂带及裂缝垂向运移至长8段,并在长8段输导层中进行短距离、小范围、树枝状的侧向运移,至有效区域聚集成藏。红河油田长8段有利勘探目标为断裂系统开启与输导层发育叠合区、储层物性"甜点"区域的岩性圈闭及局部良好侧向封堵条件的岩性-构造圈闭、超压带剩余地层压力低值区与相对低势区的叠合区域。The mechanisms and rules of hydrocarbon migration and accumulation in the Yanchang Formation of Honghe Oilfield in southwestern Ordos Basin are still unclear,which restricts the further exploration in this region. In this paper,a pressure-drop gradient model was derived in the situation of hydrocarbon migrating downward along faults and fractures in tight sandstone to investigate transport mechanisms of hydrocarbon entrapped in the Yanchang Formation of Honghe Oil？ field and analyze the rules of their migration and accumulation based on the comprehensive analysis of geologic setting,gas logging,well-logging data and results obtained by quantitative grain fluorescence techniques. The results show that the pressure-drop gradient of hydrocarbon migration downward is Δp3 = （0.028±0.01） MPa/m along the faults,and 0.24 MPa/m along the fractures;in the case that the hydrocarbon migrates downward along the fractures firstly and then along the faults, the range of pressure-drop gradient is 0.14-0.18 MPa. In the late Early Cretaceous,the hydrocarbon was generated from source rock of Chang7 member mostly,and was driven by abnormal formation pressure to be transported to Chang8 member along the faults and fractures vertically. The hydrocarbon then migrated laterally along the microfractures in short distance, within small range and forming dendritic path,and accumulated in effective regions. Finally,favorable exploration targets found in Chang8 member of Honghe Oilfield are areas having open fractures and transporting layers superimposing each other,lithologic traps in“sweet spots”area with good reservoir physical property,lithology-structure traps with better re？ gional lateral seal and layers with low residual formation pressure and relative low potential in overpressure zone.

关 键 词：定量颗粒荧光技术 压力衰降模型 输导机制 运聚规律 延长组 红河油田 鄂尔多斯盆地 

分 类 号：TE122.12[石油与天然气工程—油气勘探]