中国典型白云岩储集层特征及成藏模式

doi:10.12108/yxyqc.20230308

Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 86-98.doi: 10.12108/yxyqc.20230308

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Characteristics and accumulation model of typical dolomite reservoirs in China

DU Jiangmin^1,2, LIU Boyuan^1,2, ZHANG Yi³, JIA Zhiwei³, FU Jiyou⁴, LONG Pengyu^1,2, LUO Jinyang⁵, SHENG Jun⁶

1. Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China;
2. College of Earth Sciences, Hebei GEO University, Shijiazhuang 050031, China;
3. PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China;
4. Geological Research Institute, CNPC Xibu Drilling Engineering Company Limited, Karamay 834000, Xinjiang, China;
5. PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
6. PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China

Received:2022-10-03 Revised:2022-10-18 Online:2023-05-01 Published:2023-04-25

Abstract

Abstract: Through the review of the development characteristics of typical marine dolomite reservoirs and continental dolomite reservoirs in China， the characteristics and accumulation model of dolomite reservoirs were systematically summarized. The results show that：（1）Facies-controlled dolomite reservoirs are generally developed on the platform margin or marginal zone of intra-platform rift，and on the carbonate ramp. For example，several intraplatform rifts are developed in Sinian Dengying Formation in Tarim Basin，mound shoal dolomite reservoirs are developed around the rift，and argillaceous source rocks are filled in the rift，forming a good source-reservoir configuration.（2）The lithologies of Wumishan Formation of Mesoproterozoic Jixian System in North China Basin are mainly thick massive micritic dolostones，which are mainly of microbial origin. The reservoir quality is controlled by microbial sedimentation， structural fracturing since Indosinian and dissolution.（3）The fourth member of Sinian Dengying Formation in Gaoshiti-Moxi area of Sichuan Basin is developed with relatively high-quality dolomite reservoir with low porosity and ultra-low permeability，with an average porosity of 4.8% and an average permeability of 0.5 mD，mainly including micritic algal dolomite，crystalline dolomite and saddle dolomite. The main controlling factors for reservoir development include favorable facies belt， dolomitization and tectonism. （4）The continental dolomite reservoirs of Permian Lucaogou Formation in Junggar Basin，Cretaceous in Yin’ e Basin and Oligocene in Qaidam Basin，are generally relatively tight，with nano-micron dolomite intercrystalline pores as the main reservoir space，with porosity up to 10%， but most of the permeability less than 0.1 mD.（5）Most continental dolomites are self-generation and self-reservoir oil and gas reservoirs. They are reservoir rocks and have oil-generating capacity. The abundance and maturity of organic matters are low，but the dispersed soluble organic matters in the source rocks can generate hydrocarbons in the low maturity stage， and have high liquid hydrocarbon yield in the saline environment.（6）The continental dolomite reservoirs are mostly large continuous unconventional oil and gas reservoirs，which are widely distributed in depressions or sedimentary centers in a large scale，and together with the structural reservoirs，lithologic reservoirs and stratigraphic reservoirs formed in the high part of the structure and slope area outside the source， form a widely distributed oil and gas field group.

Key words: marine dolomite, continental dolomite, dolomite intercrystalline pores, hydrothermal dolomite, microbial dolomite, soluble organic matter, low abundance-low maturity, self-generation and self-reservoir, continuous unconventional reservoirs, accumulation model

CLC Number:

TE122.2

DU Jiangmin, LIU Boyuan, ZHANG Yi, JIA Zhiwei, FU Jiyou, LONG Pengyu, LUO Jinyang, SHENG Jun. Characteristics and accumulation model of typical dolomite reservoirs in China[J].Lithologic Reservoirs, 2023, 35(3): 86-98.

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