东营凹陷南坡古近系红层油气成藏过程——以金26井-滨斜703井剖面为例  

Hydrocarbon Accumulation Process of the Paleogene “Red Bed” in the South Slope of Dongying Depression ——By Taking the Sections of Well Jin 26 and Well Binxie 703 for Example

作　　者：孟江辉[1,2] 刘洛夫[2] 姜振学[2] 高永进[3] 

机构地区：[1]长江大学非常规油气湖北省协同创新中心,湖北武汉430100 [2]油气资源与探测国家重点实验室(中国石油大学(北京)),北京102249 [3]中石化胜利油田分公司地质研究院,山东东营257015

出　　处：《长江大学学报（自科版）（中旬）》2015年第1期1-8,共8页Journal of Yangtze University(Nature Science Edition)

基　　金：国家科技重大专项(2008ZX05051)

摘　　要：东营凹陷南坡古近系红层为沙河街组四段下亚段（EsL4）孔店组一段（Ek1）的一套红色碎屑岩沉积，是该区油气勘探的接替层系，研究其油气成藏过程对指导区内深层油气勘探具有重要意义。以金26井滨斜703井剖面为研究对象，在构造演化恢复、成藏期次划分和“源相势”控藏模型建立的基础上，剖析了油气成藏过程。研究表明：东营凹陷南坡红层经历过2期油气充注，分别发生于明化镇组（Nm）沉积期和平原组（Qh）沉积期现今；从馆陶组（Ng）沉积末期至现今，古近系普遍发育超压， Nm沉积末期超压达到最大（10.30MPa），该时期红层储层孔隙度逐渐减小，减小幅度为3%-12%；Nm沉积期以洼陷带的油气成藏为主，而斜坡带的成藏始于Qh沉积期至现今；多数油气藏分布于“源相势”耦合指数大于0.65的地区。The Paleogene'red bed'was a set of red clastic sediments of the 4th lower member of Shahejie Formation and the 1st member of Kongdian Formation in the south slope of Dongying Depression,it was an important stratum for oil and gas exploration in the area.It was of great significance for studying the hydrocarbon accumulation process for guiding the deep oil and gas exploration in the area.Based on the restoration of tectonic evolution,determination of hydrocarbon accumulation stages and the establishment of control model of sources-facies-potential on hydrocarbon accumulation,the hydrocarbon accumulation process of red bed was analyzed,by taking the section of Jin 26 of Well Binxie 703 for example.The result showed that the red bed in the south slope of Dongying Depression experienced two stages of hydrocarbon charging which occurred in the Minghuazhen period and the Pingyuan period to the present day.From the end of Guantao period to the present day,it was confirmed that the overpressure commonly existed in Paleogene,and the maximal overpressure was 10.30 MPa occurred in the late period of Pingyuan,and the porosity of red bed was reduced in the range of3%~12%.This research results show that hydrocarbon is accumulated in the depression center during the Minghuazhen period,and it has been started from the Pingyuan period to the present day,and the most of reservoirs are distributed in the areas with a coupling index of source-facies-potential higher than 0.65.

关 键 词：成藏期 成藏过程 “源-相-势”控藏 红层 东营凹陷 

分 类 号：TE121.1[石油与天然气工程—油气勘探]