Pore evolution of the Permian Qixia-Maokou Formations dolomite in Sichuan Basin based on in-situ dissolution simulation experiment

被引：0
|
作者：
Liu S. [1 ,2 ]
Chen S. [1 ,2 ]
Liu B. [1 ,2 ]
Shi K. [1 ,2 ]
Liu Y. [3 ]
Zheng H. [4 ]
Luo Q. [1 ,2 ]
机构：
[1] School of Earth and Space Sciences, Peking University, Beijing
[2] Institute of Oil & Gas, Peking University, Beijing
[3] Research Institute of Petroleum Exploration and Development, PetroChina, Beijing
[4] Hehai College, Chongqing Jiaotong University, Chongqing
来源：
Oil and Gas Geology | 2021年 / 42卷 / 03期
关键词：
Dolomite; Hydrothermal Diamond Anvil Cell (HDAC); In-situ simulation; Pore evolution; Qixia-Maokou Formations; Sichuan Basin;
D O I：
10.11743/ogg20210315
中图分类号：
学科分类号：
摘要：
A hydrothermal diamond anvil cell (HDAC) equipped with a laser raman spectroscopy (LRS) and an optical microscope was used in an in-situ simulation experiment of dissolution-precipitation process between carbonate minerals (rocks) and pore fluid under continuous closed-open-closed cell (system) conditions that are typical of a deep burial process.In line with the actual geological conditions, the experiment was carried out on the Qixia-Maokou Formations dolomite samples from the Sichuan Basin and successfully generated acetic acid in closed cell through hydrolysis of acetic anhydride.The results show that dissolution occurs at the edge and cleavage of carbonate rock samples in a closed but periodically open system, and that the dissolution range is related to acid fluid flux.After entering the closed system, the relative ion concentration of solution was measured with the (semi-quantitative) Raman spectroscopy and indicates a precipitation tendency.The experimental results and the actual geological conditions of the Permian in the Sichuan Basin jointly indicate that the evolution of intergranular pores and intergranular dissolution pores of coarse-grained dolomites in the Qixia-Maokou Formations in southwestern Sichuan Basin conforms to the experimental simulation result and that transportation of ions in acidic fluids through tectonic fractures facilitates the redistribution of pores and materials through dissolution-cementation in the system. © 2021, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：702 / 716
页数：14
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