鄂尔多斯盆地合水地区三叠系长7段页岩油储层特征及主控因素

doi:10.12108/yxyqc.20230208

Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 80-93.doi: 10.12108/yxyqc.20230208

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Characteristics and main controlling factors of shale oil reservoirs of Triassic Chang 7 member in Heshui area, Ordos Basin

XIAO Ling^1,2, CHEN Xi^1,2, LEI Ning^1,2, YI Tao³, GUO Wenjie⁴

1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. Shaanxi Provincial Key Laboratory of Oil and Gas Accumulation Geology, Xi'an 710065, China;
3. No. 12 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745400, Gansu, China;
4. No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, Gansu, China

Received:2022-07-30 Revised:2022-08-26 Online:2023-03-01 Published:2023-03-07

Abstract

Abstract: Heshui area in Ordos Basin is the main zone for the exploration and development of shale oil in Chang-qing Oilfield. Based on the data of cast thin section, physical property analysis, scanning electron microscopy, high-pressure mercury compression and nuclear magnetic resonance, the characteristics and main controlling factors of shale oil reservoirs of Triassic Chang 7 member in Heshui area of Ordos Basin were analyzed. The results show that:(1) The shale oil reservoir of Chang 7 member in Heshui area is mainly a set of dark gray-black fine siltstone, mainly lithic arkose, and the average volume fraction of fillings is 16.71%. The rock physical properties are poor, with an average porosity of 8.15% and an average permeability of 0.102 mD. It is an ultra-low porosity, extra-low porosity and ultra-low permeability reservoir.(2) The reservoir pores in the study area are mainly feldspar dissolved pores and residual intergranular pores. Sub-micron pores(0.1-1.0 μm) are the main reservoir space, accounting for 75.56% of the total pores, followed by nano pores(with diameter less than 0.1 μm), accounting for 17.94% of the total pores. The throat type is relatively complex, and the tube-shaped throats caused by dissolution and the flake and curved flake throats caused by compaction are the main throat types of the reservoir. (3) Sedimentation, diagenesis and tectonism jointly control the quality and distribution of shale oil reservoir of Chang 7 member in the study area. Sedimentation provides the material basis for the reservoir. The reservoir is mainly formed in the deep-water gravity flow sedimentary environment, which can be divided into two types:sandy clastic flow sand bodies and turbidite sand bodies. The medium-strong compaction and cementation reduce the physical properties of the reservoir. The dissolution has a certain positive effect on improving the physical properties of the reservoir. The fractures formed by tectonism improve the percolation capacity of the reservoir and are of great significance for the later fracturing and reconstruction of the reservoir.

Key words: shale oil reservoir, sub-micron pores, pore structure, sandy clastic flow sand body, turbidite sand body, diagenesis, Chang 7 member, Triassic, Heshui area, Ordos Basin

CLC Number:

TE122.2

XIAO Ling, CHEN Xi, LEI Ning, YI Tao, GUO Wenjie. Characteristics and main controlling factors of shale oil reservoirs of Triassic Chang 7 member in Heshui area, Ordos Basin[J].Lithologic Reservoirs, 2023, 35(2): 80-93.

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