Characteristics of Temporal-spatial Distribution of Fault Conduit for Hydrocarbon Migration within the Hanliu-1 Fault in Gaoyou Sag

doi:10.19657/j.geoscience.1000-8527.2022.225

Abstract

Abstract:

The Hanliu-1 fault is located on the northern border of deeply subsided area in Gaoyou sag, Subei Basin. In order to distinguish the temporal-spatial distribution of the fault conduit, fault activity rate (FAR), fault-plane geometry of the Hanliu-1 fault have been carried out for the two crucial periods of hydrocarbon migration. It is indicated that the Hanliu-1 fault was intensively active with FAR >25 m/Ma and its fault-plane geometry was featured with three obvious convex and two concave fault components during the deposition of the Sanduo Formation. Therefore, the Hanliu-1 fault was opening and three conduits occurred along the three convex fault components during this period. Since the deposition of the Yancheng Formation, the fault activity has decreased in FAR <10 m/Ma and the fault conduits have been getting closing. In conclusion, spatially, the fault conduit often occurs along convex fault component, and temporally, the fault conduit was opening as FAR >25 m/Ma and closing as FAR <10 m/Ma. As to hydrocarbon accumulation in Gaoyou sag, when the fault conduit was opening, oil migrated upwards to fill the roll-over anticline trap, and when closing, oil expelled from source rock charged immediately into the fault trap without vertical migration along the fault.

Key words: fault conduit, fault activity rate, fault-plane geometry, Hanliu-1 fault, Gaoyou sag

CLC Number:

TE122.1

CHEN Xingyue, LI Heyong, SUN Simin, CAO Yijun, XU Zhehang, ZOU Huayao. Characteristics of Temporal-spatial Distribution of Fault Conduit for Hydrocarbon Migration within the Hanliu-1 Fault in Gaoyou Sag[J]. Geoscience, 2022, 36(06): 1574-1584.

Figures/Tables 8

Fig.1 Location, structural units and stratigraphic column of the study area

Fig.2 Burial history, thermal evolution and hydrocarbon-generating history of fourth Funing member of Z86 well

Fig.3 Seismic reflection characteristics and tectonic evolution sections of the C-C' profile of Gaoyou sag across LX38 well(section location is shown in the Fig.1)

Fig.4 Fault geometry and fluid migration model along the fault plane of A-B area, Hanliu-1 fault (section location is shown in the Fig.1)

Fig.5 Fault activity rate at different periods of A-B area, Hanliu-1 fault (section location is shown in the Fig.1)

Fig.6 Process of fluid displacement along the fault zones (modified from Hooper[11], and Hao et al[9].)

Fig.7 Fault activity rate, migration capacity and hydrocarbon accumulation model of Lianmengzhuang oilfield during the deposition of Sanduo Formation (50.5-38 Ma) (section location is shown in the Fig.1)

Fig.8 Fault activity rate, migration capacity, and hydrocarbon accumulation model of Lianmengzhuang oilfield during the deposition of Yancheng Formation to the present (24.6 Ma to the present) (section location is shown in the Fig.1)

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