准噶尔盆地玛湖凹陷三叠系百口泉组储层特征及油气成藏规律

doi:10.12108/yxyqc.20240106

Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 59-68.doi: 10.12108/yxyqc.20240106

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Reservoir characteristics and hydrocarbon accumulation rules of Triassic Baikouquan Formation in Mahu Sag，Junggar Basin

YIN Lu, XU Duonian, YUE Xingfu, QI Wen, ZHANG Jijuan

PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China

Received:2023-05-24 Revised:2023-06-19 Online:2024-01-01 Published:2024-01-02

Abstract

Abstract: Through core analysis and testing, seismic thickness prediction, inclusion accumulation period analysis and source-reservoir configuration study, the reservoir characteristics and hydrocarbon accumulation rules of Triassic Baikouquan Formation in Mahu Sag of Junggar Basin were studied. The results show that:(1) The Triassic Baikouquan Formation in the slope area of Mahu Sag mainly develops fan delta deposits, with generally coarse lithologies. Relatively high-quality reservoirs are mainly distributed in underwater distributary channel microfacies and a small number of mouth bar microfacies of fan delta front, dominated by feldspathic lithic sandstone conglomerate, followed by lithic sandstone conglomerate. The rocks are generally relatively dense. The core porosity ranges from 3.17% to 23.40%, with an average of 9.04%, and the permeability ranges from 0.01 mD to 934.00 mD, with an average of 0.73 mD. It belongs to low porosity and ultra-low permeability reservoirs. The main reservoir spaces are secondary dissolved pores, with intergranular fractures and other microfractures developed.(2) The oil and gas in the study area mainly come from the shale of alkali lake in Lower Permian Fengcheng Formation, with the maximum thickest greater than 400 m. It is a residual sea lagoon facies deposit with high water sali-nity, and the lithologies are mainly composed of dolomitic mudstone and mudstone. The organic matter is mainly of type Ⅰ and Ⅱ₁. The total organic carbon(TOC) content is greater than 1.0%, the hydrocarbon generation potential (S₁+S₂) is generally greater than 6.0 mg/g, the average chloroform asphalt "A" is 0.2%, and the average HI is 322 mg/g. The organic matters are in the mature stage, and are medium-good source rocks.(3) There are three stages of hydrocarbon accumulation characteristics in the study area. Before the Late Triassic, it was the first stage of oil and gas filling, which failed to accumulate and form reservoirs. The Early Jurassic was the second stage of oil and gas filling, corresponding to yellow fluorescent hydrocarbon inclusions. The Early-Middle Cretaceous was the third stage of oil and gas filling, corresponding to blue white fluorescent hydrocarbon inclusions. The latter two stages of oil and gas filling played a major role in hydrocarbon accumulation of the Baikouquan Formation. (4) The tightness of the source-reservoir configuration in the study area is the core factor that leads to the differential accumulation of oil and gas in the west slope and east slope of Mahu Sag.

Key words: out-of-source hydrocarbon accumulation, conglomerate reservoir, differential accumulation, sourcereservoir configuration, Baikouquan Formation, Triassic, Mahu Sag, Junggar Basin

CLC Number:

TE121.1

YIN Lu, XU Duonian, YUE Xingfu, QI Wen, ZHANG Jijuan. Reservoir characteristics and hydrocarbon accumulation rules of Triassic Baikouquan Formation in Mahu Sag，Junggar Basin[J].Lithologic Reservoirs, 2024, 36(1): 59-68.

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Reservoir characteristics and hydrocarbon accumulation rules of Triassic Baikouquan Formation in Mahu Sag，Junggar Basin

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