Organic matter occurrence and pore-forming mechanisms in lacustrine shales in China

• DOI: 10.1016/j.petsci.2022.03.005
• Publication Date: 2022-03-08T18:49:26Z
• Authors: Li-Chun Kuang; Lian-Hua Hou; Song-Tao Wu; Jing-Wei Cui; Hua Tian; Li-Jun Zhang; Zhong-Ying Zhao; Xia Luo; Xiao-Hua Jiang
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology; 01 natural sciences; 0105 earth and related environmental sciences

The evolution of pore structure in shales is affected by both the thermal organic matter (OM) and inorganic diagenesis, resulting a wide variety structures. This paper examines OM distribution lacustrine its influence on structure, describes process porosity development. principal findings are: (i) Three patterns are distinguished; laminated continuous distribution, clumped stellate scattered distribution. differences total carbon (TOC) content, free hydrocarbon content (S1), among these discussed. (ii) Porosity negatively correlated with TOC plagioclase positively quartz, dolomite, clay mineral content. (iii) Pore characterized sequence decreasing-increasing-decreasing porosity, followed continuously increasing until relatively stable condition reached. (iv) A new model for evaluating proposed. Using this model, Permian Lucaogou Formation calculated to be 2.5%–5% 1%–6.3%, respectively, which correlate closely measured data. These may provide scientific basis technical support sweet spotting China.