Microscopic reservoir characteristics of different lithofacies from inter-salt shale oil reservoir in Qianjiang Sag, Jianghan Basin: a case study of Paleogene Eq34-10 rhythm

Microscopic reservoir characteristics of different lithofacies from inter-salt shale oil reservoir in Qianjiang Sag, Jianghan Basin: a case study of Paleogene Eq34-10 rhythm

Blog Article

The mineral composition, lithofacies association, pore-fracture type, pore structure and pore telemarkskongen flue development control of the Qianjiang Formation shale oil reservoir in the Qianjiang Sag of the Jianghan Basin were studied using thin section petrography, scanning electron microscopy, mercury injection-liquid nitrogen adsorption and 3D reconstruction of micro-CT.The main lithofacies of Eq34-10 rhythm (the tenth rhythm in the fourth submember of the third member of the Qiangjiang Formation) are laminated argillaceous dolomite, laminated dolomitic (calcareous) mudstone and mirabilite filled laminated dolomitic mudstone.The main reservoir porosity includes interlayer fractures, intergranular pores read more and intergranular solution pores.The pore development of inter-salt shale oil reservoir is mainly controlled by lithology and lithofacies, and the pore development degree of mirabilite filled laminated dolomitic mudstone, laminated dolomitic (calcareous) mudstone and laminated[JP3]argillaceous dolomite increase accordingly.Macro-pores are the most developed porosity in the laminated argillaceous dolomite facies, with the best pore connectivity and oil-bearing properties, and is the dominant lithofacies in the inter-salt shale oil reservoir and the most favorable exploration target.