基于构造演化分析的古近系储层预测:以辽西凸起中段沙河街组为例  

Prediction of Paleogene reservoirs based on structural evolution analysis: taking Shahejie Formation in the middle part of Liaoxi Uplift as example

作　　者：张琳琳 何京 王伟 康琳 张江涛 张金辉 ZHANG Linlin;HE Jing;WANG Wei;KANG Lin;ZHANG Jiangtao;ZHANG Jinhui(Tianjin Branch of CNOOC(China)Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《海洋地质前沿》2022年第2期62-68,共7页Marine Geology Frontiers

基　　金：中海石油(中国)有限公司“七年行动计划”重大专项课题“渤海油田上产4000万吨新领域勘探关键技术”(CNOOC-KJ135ZDXM36TJ08TJ)。

摘　　要：辽西凸起中段古近系沙河街组缺乏规模性圈闭,储层横向变化快、预测难度大,滚动勘探一直难有较大突破。针对构造、储层问题,采用基于构造演化分析的古近系储层预测方法,综合运用裂变径迹构造反演和空间平衡剖面技术,开展构造演化精细分析,改变传统地层沉积模式,提出辽西凸起高部位发育沙河街组地层的新认识,指导构造解释调整,新增沙河街组勘探层系和有利目标;结合构造约束下的叠前同步反演技术,准确预测沙河街组优势储层发育区,有效指导井位部署和钻探。近年的勘探实践证实了方法的有效性,研究区新增2个千万方级含油气构造,有力支撑了渤海油田的增储上产,也为类似区域的古近系储层研究提供了借鉴。Two problems are encountered in the middle part of Liaoxi Uplift, with regard to the reservoir prediction for Shahejie Formation: the lack of large-scale traps and the rapid lateral variation in reservoirs, which have made reservoir prediction difficult and limited the progress of rolling exploration. In order to solve these problems, we turned the way of research to carry out the Paleogene reservoir prediction upon structural evolution. Using the methods of fission track structure inversion and space balance profiling, detailed study of structural evolution was conducted. This approach abandoned the traditional stratigraphic deposition model, and proposed a new way of thinking for the Shahejie Formation. It is assumed that the Shahejie Formation might occur as well in the high part of Liaoxi uplift. Based on the new understanding, new exploration strata and favorable targets in Shahejie Formation are re-selected. Combined with the pre-stack synchronous inversion technology under structural constraints, the development area of the dominant reservoirs in Shahejie Formation was accurately predicted,and the well position deployment and drilling were effectively performed. The exploration practice in recent years has proved the effectiveness of the new understanding. Two new gas oil-bearing structures of ten million cubic meters of reserves have been discovered in the study area, which strongly supported the increase in oil and gas reserve and production of the Bohai Oilfield, and also provided a reference for the study of Paleogene reservoirs in similar areas.

关 键 词：古近系 构造演化 裂变径迹反演 空间平衡剖面技术 储层预测 

分 类 号：P744.4[天文地球—海洋科学]