辽中南洼西斜坡断-盖耦合类型及其控藏作用——以旅大A油田为例

发布时间：2018-02-24 20:20

本文关键词： 有效断接厚度断-盖耦合控藏作用辽中南洼旅大A油田　出处：《断块油气田》2017年02期 　论文类型：期刊论文

【摘要】：为弄清辽中凹陷南次洼西斜坡的油气分布规律,利用三维地震数据和钻井资料,对旅大A油田的盖层与油源断裂发育特征进行系统研究,从而明确了研究区断-盖耦合类型及其对油气成藏的控制作用。研究结果表明,研究区不同构造断-盖耦合类型差异悬殊,断-盖耦合关系对油气富集层系具有明显控制作用。其中:北部A-1构造断-盖耦合类型为封闭型,油源断裂与盖层耦合关系较好,有效断接厚度较大(278 m),大于有效断接厚度封油的临界值(100~150 m),油气被完全封盖在盖层之下的东三段储层;而南部A-2构造断-盖耦合类型为半封闭型,油源断裂与盖层耦合关系差,有效断接厚度小(98 m),部分油气沿油源断裂垂向运移,在盖层之上的东一段和东二上亚段储层富集。
[Abstract]:In order to understand the oil and gas distribution law of the west slope of Nanziwa in Liaozhong sag, the development characteristics of caprock and oil source faults in Lida A oilfield are systematically studied by using 3D seismic data and drilling data. Thus, the types of fault-cap coupling and their controlling effect on hydrocarbon accumulation in the study area are clarified. The results show that there are great differences in the types of fault-cap coupling between different structures in the study area. The coupling relationship between fault and cap has obvious controlling effect on oil-gas enrichment strata, among which the type of fault-cap coupling of A-1 structure in the north is closed, and the coupling relationship between oil source faults and caprocks is good. The thickness of effective fracture is larger than 278mW, which is larger than the critical value of sealing oil with effective fracture thickness of 150mg, and oil and gas are completely capped in the reservoir of the third member of the east under the caprock, while the type of fault-cap coupling of the southern A-2 structure is semi-closed, and the coupling relationship between oil source faults and caprocks is poor. The effective fault thickness is less than 98 m, and some oil and gas are migrated vertically along the oil source fault, and are enriched in the east first member and the east second upper submember above the caprock.
【作者单位】：中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项专题“渤海海域大中型油气田地质特征”(2011ZX05023-006-002)
【分类号】：P618.13

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