东濮凹陷古近纪盆地结构控烃控藏特征

doi:10.19657/j.geoscience.1000-8527.2020.06.081

摘要/Abstract

摘要：

对东濮凹陷的盆地结构、构造样式等进行了解析,认为东濮凹陷古近纪盆地具有多断、多凸、多洼的结构特征,多凸多洼的盆地结构控洼控烃,形成多凸多洼多成藏运聚单元。始新统沙河街组沙四段上亚段—沙三段下亚段沉积期为初—强断陷期,单断广盆过渡为强断深盆,湿润气候、湖盆广、水体深,为强还原环境,烃源岩品质优;沙三段中亚段—上亚段沉积期为多断断陷期,湖盆变缓、分割性强、水体中等,烃源岩在各自小洼中心处富集、品质一般;沙二段沉积期为弱断陷期,多洼格局持续、成烃单元独立成藏开始期,干旱气候、漫湖—浅水小湖型、水体浅,烃源岩不发育,盆地东部洼陷带沙四段上亚段—沙三段下亚段地层埋深较大区域进入生烃门限,烃源岩快速成熟。东营运动时期油藏主要以调节作用为主,早期生成的油气被小断裂改造,形成诸多小断块油气藏,是东濮凹陷主要成藏期。明化镇组沉积晚期—现今,断裂活动减弱,洼陷带地层厚度补偿后继续生烃,油气主要在低部位成藏。

关键词: 东濮凹陷, 多凸多洼, 盆地结构, 构造演化, 油气成藏

Abstract:

This paper analyzes the structure and structural style of Dongpu sag basin, and concludes that the Paleogene basin of Dongpu sag has the structural characteristics of multi-fault, multi-convex and multi-sub-sag.The multi-convex and multi-sub-sag basin structure controls the sub-sag and the hydrocarbon, and forms the multi-convex and multi-sub-sag and multi-reservoir migration unit. The sedimentary period of the upper sub-member of the fourth member and the lower sub-member of the third member of Shahejie Formation is the early-strong fault depression period, and the transition from single fault wide basin to strong fault deep basin, with a humid climate, wide lake basin and deep water body, is a strong reduction environment, and the quality of hydrocarbon source rocks is excellent. The sedimentary period of the middle and upper sub-member of the third member of Shahejie Formation is more faulted period, with the lake basin becoming slow, highly segmented and medium water body. The hydrocarbon source rocks are concentrated and of general quality in the center of each depression.The sedimentary period of the second member of Shahejie Formation is a weak faulted period, with a continuous multi-depression pattern and an independent hydrocarbon generating unit at the beginning of accumulation. The source rocks are not developed in a dry climate, a small lake-shallow water type, and a shallow water body. In the eastern sag belt of the basin, the area with a large buried depth of the upper and lower sub-member of the forth member of Shahejie Formation enters the threshold of hydrocarbon generation, and the source rocks mature rapidly. During the Dongying movement, the reservoir is mainly regulated, and the oil and gas generated in the early stage is transformed by small faults to form many small fault blocks. From late sedimentary period of Minghuazheng Formation to present, the fault activity is weakened, the formation thickness compensation in the sag zone continues to generate hydrocarbon, and the hydrocarbon accumulation is mainly in the lower part.

Key words: Dongpu sag, more convex and hollow, basin structure, tectonic evolution, hydrocarbon accumulation

中图分类号:

TE121.2

余海波, 程秀申, 徐田武, 谈玉明, 漆家福. 东濮凹陷古近纪盆地结构控烃控藏特征[J]. 现代地质, 2020, 34(06): 1119-1131.

YU Haibo, CHENG Xiushen, XU Tianwu, TAN Yuming, QI Jiafu. Characteristics About Hydrocarbon Accumulation Controlled by Structure in Paleogene of Dongpu Sag[J]. Geoscience, 2020, 34(06): 1119-1131.

图/表 9

图1 东濮凹陷构造单元划分及测线位置图

Fig.1 Division of tectonic units and line location of Dongpu Sag

图2 东濮凹陷北区东西向测线地震时间域构造解释及深度域地质剖面(测线位置见图1中AA')

Fig.2 Tectonic interpretation in time domain and geological profile in depth domain of east-west seismic line in north of Dongpu sag

图3 东濮凹陷北区、中区、南区深度域地质剖面(测线位置见图1中AA'、BB'、CC',北区测线见图2AA')

Fig.3 Geological profiles of depth domain in north, middle and south of Dongpu sag

图4 东濮凹陷4期主要同沉积断层开始活动的垂直断距图

Fig.4 The vertical fault displacement as the sedimentary fault activity in the four stages of Dongpu sag

图5 东濮凹陷沙四上亚段同生断层控制的洼陷分布(a)及优质烃源岩等厚图(b)

Fig.5 Sub-sag distribution (a) and isopachic map of high-quality source rock(b) controlled by syngenetic fault in the sedimentary periodof the upper sub-member of the forth member of Shahejie Formation in Dongpu sag

图6 东濮凹陷沙三下亚段同生断层控制的洼陷分布(a)及优质烃源岩等厚图(b)

Fig.6 Sub-sag distribution(a) and isopachic map of high-quality source rock(b) controlled by syngcnctic falutin the sedimentary period of lower sub-member of the third member of Shahejie Formation in Dongpu sag

图7 东濮凹陷沙三中1-4砂组沉积期同生断层控制的洼陷分布(a)及优质烃源岩等厚图(b)

Fig.7 Sub-sag distribution (a) and isopachic map of high-quality source rock(b) controlled by syngcnctic falutin the sedimentary period of I to 4 sardy of the third member of Middle Shahejie Formation in Dongpu sag

图8 东濮凹陷胡庆—文留地区断裂演化控藏剖面图

Fig.8 Section diagram of fault evolution and reservoir control in the Huqing-Wenliu area of Dongpu sag

图9 东濮凹陷东营组剥蚀厚度及分布

Fig.9 Denudation thickness and distribution of Dongying Formation in Dongpu sag

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