鄂尔多斯盆地西南部二叠系盒8下段储层特征及控制因素

doi:10.12108/yxyqc.20210203

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 17-25.doi: 10.12108/yxyqc.20210203

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Reservoir characteristics and controlling factors of Permian lower He 8 member in southwestern Ordos Basin

WEI Qinlian^1,2, CUI Gaixia^1,2, LIU Meirong³, LYU Yujuan³, GUO Wenjie³

1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China;
3. No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, Gansu, China

Received:2020-09-27 Revised:2020-11-25 Online:2021-04-01 Published:2021-03-31

Abstract

Abstract: The Permian lower He 8 member in southwestern Ordos Basin is the main gas producing layer. In order to clarify the reservoir characteristics and controlling factors in this area,the reservoir characteristics and controlling factors of the Permian lower He 8 member were studied by means of casting thin section,scanning electron microscope,high-pressure mercury injection and reservoir physical properties. The results show that:(1) The pore types of the Permian lower He 8 member in southwestern Ordos Basin are dominated by lithic dissolved pores and intergranular pores,followed by intercrystalline micropores,and the throat radius is generally small. (2) The rock composition has an important influence on the reservoir pore structure type of the Permian lower He 8 member in the study area. The high content of quartz is conducive to the development and preservation of primary pores and has a better pore structure.(3) Diagenesis is the key factor leading to the difference in reservoir pore structure of the lower He 8 member in the study area. Compaction and cementation have a certain destructive effect on the pore structure,and they are important factors that lead to tight reservoirs in the study area. Dissolution has a positive effect on physical properties,but its improvement effect is limited. The research results can be used as a reference for fine exploration of Permian tight reservoirs in southwestern Ordos Basin.

Key words: tight sandstone, pore structure, lower He 8 member, Permian, Ordos Basin

CLC Number:

TE122.2

WEI Qinlian, CUI Gaixia, LIU Meirong, LYU Yujuan, GUO Wenjie. Reservoir characteristics and controlling factors of Permian lower He 8 member in southwestern Ordos Basin[J].Lithologic Reservoirs, 2021, 33(2): 17-25.

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Reservoir characteristics and controlling factors of Permian lower He 8 member in southwestern Ordos Basin

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