莺歌海盆地莺东斜坡带隐蔽油气藏类型及成藏主控因素

HIDDEN RESERVOIR TYPES AND MAIN HYDROCARBON ACCUMULATION FACTORS IN YINGDONG SLOPE OF YINGGEHAI BASIN

莺东斜坡带具有“两脊一洼”分段式展布之特殊区域地质构造格局,且自北而南“两脊一洼”三段式分布具有明显不同的构造及断裂活动特征与油气运聚规律,故不同区域区带隐蔽油气藏类型及成藏主控因素差异明显,其中,北段(即北延伸脊)成藏主控因素主要取决于烃源及油气运聚输导系统;中段(一洼即岭头断阶区)成藏主控因素则受控于烃源与岩性圈闭的有效性;南段(南延伸脊)成藏主控因素主要取决于地层岩性复合圈闭的有效性。根据不同类型隐蔽油气藏的成藏主控因素及分布规律,即可采取不同的研究方法及勘探技术对策,以期获得油气勘探的突破。

Yingdong slope geological framework is characterized by “two ridge and one depression”.Thus the slope is divided into three sections with different structures and fault actions resulting in distinct hidden oil-gas pool types and main hydrocarbon accumulation factors.In the north section(N-trending extension ridge),hydrocarbon accumulation factors mainly depend on resources and oil-gas migration-accumulation system. The middle section (“one-depression ”, i. e . Lingtou fault-stage region) is under the control of hydrocarbon resources and lithologic trap as well. The south section(S-trending extension ridge) depends on compound lithologic traps. According to main hydrocarbon accumulation factors and distribution rules of different hidden reservoirs, various research methods have been adopted and exploitation plan worked out,so that an important breakthrough may be made in exploration activity.