冀中坳陷石炭—二叠系烃源岩埋藏-生烃史控制因素

Control factors of burial-hydrocarbon generation history of Carboniferous-Permian source rocks in Jizhong Depression

冀中坳陷石炭—二叠系烃源岩经历了复杂的构造-埋藏历史,划分为4个演化阶段及多次生烃演化过程。构造格局呈现出先东倾、后西倾的"翘翘板式"变化,构造平面上表现出"东西分带,南北分区"的特征。石炭—二叠系烃源岩残留厚度具有中间厚两边薄的特点,埋藏深度整体上呈现东浅西深、南浅北深的格局。基于构造演化史、沉积史、剥蚀史的研究,文中分别论述了大城凸起、河西务构造带、武清凹陷杨村斜坡-文安斜坡的石炭—二叠系烃源岩的埋藏-生烃史,得出大城凸起、武清凹陷杨村斜坡-文安斜坡是较为有利的勘探区域。

The hydroeal＇bon source rocks of Carboniferous-Pennian in Jizhong Depression underwent a complex tectonic-burial histol7 and four evnhltion stages, and evolution proeesses of hydrocarbon generation took place with many times. Current tectonic pattern shows the ＂seesaw＂ type changes of dipping toward east at first and then dipping toward west. It shows the feature of west-east zoning and north-soulh partilion in the plane. Residual thickness presents the feature with the thick in the middle and the thin in both sides. Burial depth shows a shallow burial in the eastern part and deep burial in the western part, shallow in the southern part and the deep in the nnrlhern part. Based on the study of structural evolution history, sedimentary history and denudation history, this paper discusses the burial-hydrncarbon generation history of Carboniferous-Permian source rocks in Dacheng bulge, Hexiwu structural zone, Yangcun slope-Wenan slope in Wuqing Depression. It is believed that the Dacheng bulge and Yangeun slope-Wenan slope in Wuqing Depression are favoudle exploration areas.