论文部分内容阅读
为深入认识渤海湾盆地潍北凹陷油气藏的形成过程和油气分布,利用IES-PetroMod盆地模拟和流体包裹体研究方法对潍北凹陷孔店组烃源岩的生烃史和油气藏形成时间与期次进行了分析。结果表明,潍北凹陷发育孔二段上、中、下3套烃源岩,存在北部深洼区和东南部2个沉降中心,以北部深洼区为主体,具有2次生烃过程:沙四段沉积中期至沙河街期构造运动为第一次生烃,生烃中心以北部洼陷带为主,且3套烃源岩均已进入成熟生烃阶段,生烃持续时间长,生烃贡献量大;后期东营期构造运动的剥蚀使得生烃作用基本停滞,仅在晚期沉降量大于剥蚀量的西北部地区于馆陶中后期存在二次生烃。该区已发现的油气藏具有明显的2期成藏特征:沙四中期至沙河街期构造运动是油气的第一期充注,研究区大部分的油气藏形成于该时期,受各项地质条件的限制,分布在保存条件较好的灶户鼻状带;馆陶中后期至今为第二期充注,仅在二次生烃区及其附近形成油气聚集,是寻找深部天然气的有利地区。
In order to further understand the formation process and hydrocarbon distribution of the reservoirs in the Weibei Depression in the Bohai Bay Basin, the hydrocarbon generation history and hydrocarbon accumulation of the source rocks of the Kongdian Formation in the Weichang Depression are compared with those of the fluid inclusions using the IES-PetroMod basin modeling and fluid inclusion The period was analyzed. The results show that there are three sets of upper, middle and lower source rocks in the second member of the Well of Kongbei Depression. There are two subsidence centers in the northern deep and southeastern parts of the depression, and the northern part of the deep depression has two secondary hydrocarbon generation processes: sand The tectonic movement in the middle period of the deposition of the fourth segment to the Shahejie period is the first hydrocarbon generation and the northern part of the hydrocarbon generation center is mainly located in the northern part of the subduction zone. All three sets of source rocks have entered the mature hydrocarbon generation stage, with long hydrocarbon generation and hydrocarbon generation The denudation of Dongying tectonic movement made the hydrocarbon generation basically stagnate, and only secondary hydrocarbon generation existed in the late Guantao area in the northwestern part where the late sedimentation amount was greater than the denuded amount. The discovered reservoirs in the area have obvious characteristics of second-stage reservoir formation. The tectonic movement from the middle Shahe to the Shahe period is the first charge of oil and gas. Most of the oil and gas reservoirs in the study area were formed during this period. The conditions are limited and distributed in the cooker nose zone with good preservation conditions. Since the late filling period of Guantao is the second filling, the accumulation of oil and gas is only formed in and around the secondary hydrocarbon generating area, which is a favorable area for finding deep natural gas .