莱州湾凹陷东北洼“走滑-伸展”复合断裂控藏机理及勘探启示

doi:10.11743/ogg20190511

Abstract

Abstract: The study area,jointly controlled by the NE-trending strike-slip stress and the NS-trending extensional tectonic stress,is located in the northeastern Laizhou Bay Sag,and the southern eastern branch of the Tanlu strike-slip fault zone.Analysis of the fault distribution and structural evolution of the composite stress zone reveals that KL6A block is mainly controlled by extensional stress;that the most favorable trap is faulted anticline formed jointly by the inherited extensional fault controlling traps and the strike-slip transpressional stress;and that the anticline and faulted anticline trap,developed at the strike-slip pressure buildup section of KL6B and KL6C blocks situated in the major strike-slip stress zone,are the most favorable areas for hydrocarbon preservation.Thereafter,we put up an innovative concept of differential reservoir-controlling effect of strike-slip faults,featuring "transpression press-controlled trap,transtension stress-controlled hydrocarbon migration".The transtentional segment of the strike-slip faults serves as the main path for oil-gas migration,making a breakthrough in the exploration of slope areas.In addition,a ternary reservoir-controlling model of "Source-Fault-Trap" is established,and it is believed that the discovered oil-gas reservoirs can act as transfer stations for further migration up to traps of even higher horizons,facilitating the exploration of slope zones.Blocks of hydrocarbon enrichment are discovered in the top traps of the Dongying Formation,which was originally considered to be poor in migration conditions,marking a major breakthrough in oil-gas exploration.

Key words: tectonic evolution, hydrocarbon accumulation model, Tanlu strike-slip zone, Laizhou Bay Sag, Bohai Sea

CLC Number:

TE121.2

Shi Wenlong, Niu Chengmin, Yang Bo, Wang Liliang, Deng Hui, Wang Hang, Zhang Delong. Mechanism of “strike-slip-extensional” composite faults-controlled hydrocarbon accumulation in the northeastern Laizhouwan Sag, and its enlightenment for exploration[J]. Oil & Gas Geology, 2019, 40(5): 1056-1064.

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Mechanism of “strike-slip-extensional” composite faults-controlled hydrocarbon accumulation in the northeastern Laizhouwan Sag, and its enlightenment for exploration

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