义和庄地区地层油气藏分布特征及控制因素

Distribution characteristics and controlling factors of stratigraphic reservoirs in Yihezhuang Area

张家震 徐 备 2 杨 静

造山带与地壳演化教育部重点实验室，北京 100871 北京大学地球与空间科学学院，北京 100871 中原油田分公司勘探开发科学研究院，河南 濮阳 457001

Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Beijing 100871, China School of Earth and Space Sciences, Peking University, Beijing 100871, China Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

义和庄凸起是一个在对基底构造层长期改造基础上发展起来的大型正向构造单元，基底地层长期遭受风化剥蚀，沉积盖层超覆其上。受区域构造运动影响，义和庄凸起及其北部斜坡带发育多期区域不整合，地层超覆、剥蚀现象十分普遍。义和庄地区地层接触关系复杂，有利于各类地层圈闭的形成，是济阳坳陷地层油气藏最发育的油气聚集带之一。超覆油气藏、不整合油气藏、潜山油气藏具有不同的形成条件与控制因素，分别发育于不同的层系与区带，其分布规律主要受区域构造运动、油源条件、疏导体系等因素控制。区域构造运动形成的不整合面上、下分别发育超覆圈闭和不整合圈闭，基底反向正断层控制潜山圈闭的分布。车西、大王北、郭局子、四扣等生油洼陷为义和庄地区提供了丰富的油气来源，断层、不整合面与渗透性地层构成的立体网络式输导体系有利于油气在各类地层圈闭中聚集成藏。

Yihezhuang Salient is a large positive structural unit which has developed on the basis of reconstructing to the basement strata in a long time. The basement strata have a long-term process of weathering and denudating, and the sedimentary cover strata overlaped on it. Owing to the regional tectonic movements, multi-stage unconformities formed in Yihezhuang Salient and its northern slope belt and overlaping and denudating are universal. There are complex contacting relationships within different strata, so Yihezhuang Area has advantageous conditions of forming stratigraphic traps and is one of the richest oil-gas accumulation zones of stratigraphic reservoirs in Jiyang Sag. Overlap reservoirs, unconformity reservoirs and buried hill reservoirs have different forming conditions and controlling factors, and they are developed in different strata and zones respectively. Their distribution is mainly controlled by regional tectonic movement, oil source condition and transport system. Overlap traps caused by regional tectonic movements are above the unconformity surfaces, whereas unconformity traps are below them. Buried hill traps are concomitant with reverse normal faults in basement strata. Chexi, Dawangbei, Guojuzi and Sikou oil-generating subsages provide abundant hydrocarbon for stratigraphic traps in Yihezhuang Area. Faults, unconformities and permeabile formations are interrelated with each other and compose a three-dimensional network-like transport system, which is favorable for hydrocarbon accumulating in stratigraphic traps in Yihezhuang Area.