非烃源岩层系断层和砂体对油气运聚的控制作用

Control of hydrocarbon migration and accumulation by fault and sand body in non-source rocks layers

综合运用地震、测井、录井和分析化验等资料,对胜利油田滨海北部新近系断层和砂体对油气运聚的控制作用进行研究。结果表明:断层活动性控制油气分布的规模和层系,断层封闭能力控制油藏的最大含油高度,反向遮挡断层圈闭比顺向遮挡断层圈闭封闭能力强;砂地比小于0.15的砂层组不利于油气运聚,砂地比为0.15～0.5的砂组有利于油气聚集,大于0.5的砂层组有利于油气的输导;主干断层-主河道砂体型组合是最有利的油气运聚组合;'定区-定砂组-定点'的思路可以有效地指导非烃源岩层系河流相油气勘探。

Based on the data of seismic, well logging, mud logging and analysis assay, the control of hydrocarbon migration and accumulation by fault and sand body in the Neogene of northern coastal area, Shengli Oilfield was analyzed. The results show that fault activity controls the size and layers of oil and gas distribution. Fault sealing controls the maximum oil height of reservoir, and the sealing ability of fault-screened trap is better than that of co-dip fault-screened trap. The sand groups whose sand to formation thickness ratios are less than 0.15 are not benefical to hydrocarbon migration and accumulation, the sand groups whose sand to formation thickness ratios are 0.15-0.5 are considered favorable to hydrocarbon accumulation and the sand groups whose sand to formation thickness ratios are greater than 0.5 are beneficial to hydrocarbon migration. The combination of trunk fault and main channel sand body is the most favorable combination for hydrocarbon migration and accu- mulation. The petroleum exploration in non-source rocks layers can be effectively guided by the exploration thinking way of ＂ fix district-fix sand group-fix point＂.