川东地区中二叠统茅口组一段储层特征与形成模式

doi:10.11743/ogg20220611

Abstract

Abstract:

Significant exploration discoveries have recently been made in unconventional argillaceous limestone of the first member of the Middle Permian Maokou Formation （Mao-1 Member） in the eastern Sichuan Basin. An integration of field outcrop and core observation， thin section identification， petrophysical analysis， X-ray diffraction， nitrogen adsorption， Ar-ion field emission scanning electron microscopy （FE-SEM）， TOC measurement and CT scanning， as well as well logging data interpretation， is applied to the study of reservoir characteristics and controlling factors of the Mao-1 Member argillaceous limestone. It is shown that micrite， micritic bioclastic limestone， bioclastic micritic limestone and argillaceous bioclalstic micritic limestone dominate the Mao-1 Member with intergranular pores （fractures）， organic pores， dissolved pores （fractures）， fractures and talc shrinkage pores （fractures） well developed as reservoir spaces. The micrite and micritic bioclastic limestone， among others， are low in porosity and organic matter content， and with poor storage capacity. While bioclastic micritic limestone and argillaceous bioclastic micritic limestone， are high in porosity and organic matter content， and of good reservoir capacity. The Mao-1 Member reservoirs in the eastern Sichuan Basin are under the joint control of sedimentary lithofacies， organic matter abundance and diagenetic process. The bioclastic micritic limestone and argillaceous bioclastic micritic limestone microfacies are the most favorable reservoirs rich in pores and clay minerals. The clay micropores and organic pores generated from clay mineral transformation function as the main storage space in the Mao-1 Member； besides， the pores related to dissolution and dolomitization contribute another part of the reservoir space. Finally， the reservoir development model of the Mao-1 Member in the eastern Sichuan Basin is established. During the sedimentary period， due to the differences in original fabric， the bioclastic micritic limestone and argillaceous bioclastic micritic limestone have original pores well developed； during the medium to deep burial phase， sepiolite underwent diagenetic transformation， forming a large number of clay micropores and organic pores， meanwhile releasing Mg²⁺-enriched diagenetic fluid and resulting in dolomitization； and during the deep burial period， under the modification of acid fluid， high-quality reservoirs formed in bioclastic micritic limestone and argillaceous bioclastic micritic limestone formations.

Key words: pore structure, reservoir space tpye, rock type, reservoir development model, unconventional reservoir, Makou Formation, eastern Sichuan Basin

CLC Number:

TE122.2

Jianping Fan, Jinmin Song, Qingchun Jiang, Shugen Liu, Yuehao Ye, Shipeng Huang, Jiarui Wang, Wang Su, Liji Li, Xin Jin, Yuxiang Feng. Reservoir characteristics and development model of the Middle Permian Mao-1 Member in eastern Sichuan Basin[J]. Oil & Gas Geology, 2022, 43(6): 1413-1430.

Figures/Tables 13

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Reservoir characteristics and development model of the Middle Permian Mao-1 Member in eastern Sichuan Basin

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