准噶尔盆地玛中地区二叠系—三叠系叠合成藏特征及主控因素

doi:10.12108/yxyqc.20210107

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 71-80.doi: 10.12108/yxyqc.20210107

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Characteristics and main controlling factors of Permian-Triassic superimposed reservoirs in central Mahu Sag,Junggar Basin

CHEN Jing, CHEN Jun, LI Hui, NUERAILI Zhaman

Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China

Received:2020-08-04 Revised:2020-11-04 Online:2021-02-01 Published:2021-01-25

Abstract

Abstract: Mahu Sag is a hydrocarbon generation deperession with the highest hydrocarbon accumulation degree in Junggar Basin,and Permian-Triassic has great exploration potential. In order to study the characteristics and main controlling factors of its superimposed reservoirs,a large number of analyses of mud-logging, well logging,core analysis and oil test data were carried out,and 3D seismic data was interpreted. The results show that:(1)There are two sets of high-quality reservoirs developed in central Mahu Sag,including Permian lower Urho Formation and Triassic Baikouquan Formation. The front edge of fan delta is a favorable belt for oil and gas enrichment. Under the background of lacustrine transgression,sand bodies are superimposed and connected in many stages,which has geological conditions for forming large lithologic trap group.(2)The reservoir-cap assemblage is well configured, sand bodies are vertically overlapped,and lateral faults and overlying delta plain subfacies mudstone can provide shelter for hydrocarbon accumulation.(3)High-angle strike-slip faults and a series of associated structures are developed in the study area. Deep faults communicate with oil sources,and shallow faults control traps and reservoirs,together with unconformities, they form a highly efficient transport system,which is an important controlling factor for multi-layer superimposed reservoirs. The research results have reference significance for mid-deep oil and gas exploration in central Mahu Sag.

Key words: fan delta front, glutenite reservoir, lower Urho Formation, Baikouquan Formation, Mahu Sag, Junggar Basin

CLC Number:

TE122.2

CHEN Jing, CHEN Jun, LI Hui, NUERAILI Zhaman. Characteristics and main controlling factors of Permian-Triassic superimposed reservoirs in central Mahu Sag,Junggar Basin[J].Lithologic Reservoirs, 2021, 33(1): 71-80.

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Characteristics and main controlling factors of Permian-Triassic superimposed reservoirs in central Mahu Sag,Junggar Basin

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