Structure Evolution and Middle-Shallow Hydrocarbon Enrichment Patters in the Eastern Wushi Sag

doi:10.3969/j.issn.1006-6535.2020.05.010

Abstract

Abstract: The stress field, fault properties and structural evolution were analyzed to further understanding the complex faults and high sand content of middle-shallow reservoirs and clarify the hydrocarbon accumulation and enrichment patternsin the eastern Wushi Sag. Research indicates that The extending stress field of Wushi Sag in the Paleocene to Middle-Early Eocene showed a NW-SE direction, and rotated clockwise to near SN direction in Oligocene, and changed to NE-SW direction from the late Oligocene to Miocene. The eastern Wushi Sag successively experienced the Paleozoic-Eocene rift, Oligocene strength slippage and Neogene heat deposition stages. Statistic and analysis of regional drilling, mud logging, oil column height and other data indicate that there are great differences in the lateral and longitudinal hydrocarbon accumulation in the middle-shallow Liu-1 Member and Weizhou Formation in Wushi Sag. Hydrocarbon mainly enriched in the skirt zone far away from the central part of “flower” structure, showing peripheral petal enrichment. The middle-shallow reservoirs in Wushi Sag are characterized by block and toothbrush-like distribution. This research could provide certain guidance for the middle-shallow reservoir exploration deployment in the eastern Wushi Sag.

Key words: Wushi Sag, structural evolution, flower structure, middle-shallow reservoir, hydrocarbon enrichment pattern

CLC Number:

TE122.2

Hu Lin, Jin Qiuyue, Yang Xibing, Hu Desheng, Lu Mei. Structure Evolution and Middle-Shallow Hydrocarbon Enrichment Patters in the Eastern Wushi Sag[J]. Special Oil & Gas Reservoirs, 2020, 27(5): 68-73.

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