川东北沙溪庙组天然气地球化学特征及地质意义——以五宝场地区为例

doi:10.12108/yxyqc.20210119

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 209-219.doi: 10.12108/yxyqc.20210119

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Geochemical characteristics and geological significance of Shaximiao Formation in northeastern Sichuan Basin: a case study fromWubaochang area

XU Yuxuan¹, DAI Zongyang¹, HU Xiaodong², XU Zhiming¹, LI Dan²

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. Northeast Sichuan Gas Field, PetroChina Southwest Oil & Gas Field Company, Dazhou 635000, Sichuan, China

Received:2020-05-12 Revised:2020-07-01 Online:2021-02-01 Published:2021-01-25

Abstract

Abstract: The shallow tight gas of Jurassic Shaximiao Formation in northeastern Sichuan Basin has many advantages, such as low investment cost,quick effect,wide distribution,large amount of resources and shallow burial depth,so it is an efficient exploration and development object. Through the collection of natural gas of Jurassic Shaximiao Formation and underlying source rocks in Wubaochang area of northeastern Sichuan Basin,the natural gas components,carbon isotopes,vitrinite reflectance,microscopic components and total organic carbon content were determined. Combined with analysis of natural gas and source rock samples,the gas source of Jurassic Shaximiao Formation in northeastern Sichuan Basin was discussed. Combined with typical reservoir accumulation section of Shaximiao Formation and the present development degree of tight gas in northeastern Sichuan Basin, the typical reservoir accumulation model of Jurassic Shaximiao Formation in northeastern Sichuan Basin was analyzed. The results show that the natural gas of Jurassic Shaximiao Formation in northeastern Sichuan Basin mainly comes from the underlying lacustrine source rocks of Jurassic Ziliujing Formation and coal measure source rocks of Triassic Xujiahe Formation. The source rocks of Jurassic Ziliujing Formation in northeastern Sichuan Basin are type Ⅱ1-Ⅱ2 high mature medium-good source rocks,and the source rocks of Xujiahe Formation are type Ⅲ over-mature source rocks. The Wubaochang and Dukouhe areas in the front margin of the Daba Mountain in northeastern Sichuan Basin have good conditions for tight gas accumulation,and are the key areas for next shallow tight gas exploration. The exploration should focus on finding favorable zones of Shaximiao Formation,increase the exploration wells of underlying Ziliujing Formation and Xujiahe Formation to obtain more geological data, and expand the exploration and development scope outwards withWubaochang and Dukouhe areas as the center.

Key words: geochemical characteristics, gas reservoir characteristics, hydrocarbon source rocks, Shaximiao Formation, northeastern Sichuan Basin

CLC Number:

TE122.1

XU Yuxuan, DAI Zongyang, HU Xiaodong, XU Zhiming, LI Dan. Geochemical characteristics and geological significance of Shaximiao Formation in northeastern Sichuan Basin: a case study fromWubaochang area[J].Lithologic Reservoirs, 2021, 33(1): 209-219.

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Geochemical characteristics and geological significance of Shaximiao Formation in northeastern Sichuan Basin: a case study fromWubaochang area

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