渤海湾盆地埕北凹陷东营组构造沉积特征及油气成藏条件

STRUCTURAL AND SEDIMENTARY FEATURES OF THE DONGYING FORMATION,CHENGBEI SAG,BOHAI BAY BASIN AND THEIR BEARING ON HYDROCARBON ACCUMULATION

为深入认识渤海湾盆地埕北凹陷东营组储层发育的类型及分布规律,综合利用地质地球物理及钻井和测井等资料,在沉积体系及构造特征研究的基础上,研究了埕北凹陷东营组的构造特征、成藏控制因素、油藏类型及油气分布规律。埕北断层及其主要派生分支断层控制了古近系的发育和分布,也是凹陷内生成的油气向上运移的主要通道。而凹陷内部和南斜坡的断层多为层间断层,规模小,难以形成构造圈闭。该区油气成藏包括西南缓坡带和东北部陡坡凸起带两个成藏体系,构造因素与沉积体系配置是东营组油气成藏的主控因素。北部断裂带构造主控油藏和南部缓坡带地层油藏均具有一定的勘探潜力。

Based on the geological, geophysical and well data, structural features, hydrocarbon accumula- tion and distribution patterns of the Dongying Formation in the Chengbei Sag are studied. The Chengbei fault and its branches controlled the distribution pattern of the Paleogene, and acted as the main oil migra- tion path. However, the faults in the inner sag and on the southern slope are mostly the small interlayered faults difficult to form traps. Hydrocarbon accumulation systems consist of the southwestern gentle slope and the northeastern steep slope in the sag, and thus the structural and sedimentary combination is the main controlling factor of the hydrocarbon accumulation in the Dongying Formation. There is exploration potential in the structure-controlled reservoirs in the northern fault zone and the stratigraphic reservoirs in the southern gentle slope zone.