基于原位溶蚀模拟实验的四川盆地二叠系栖霞组-茅口组白云岩孔隙演化

doi:10.11743/ogg20210315

Abstract

Abstract:

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.

Key words: Hydrothermal Diamond Anvil Cell (HDAC), in-situ simulation, pore evolution, dolomite, Qixia-Maokou Formations, Sichuan Basin

CLC Number:

TE122.3

Shiqi Liu, Senran Chen, Bo Liu, Kaibo Shi, Yuyang Liu, Haofu Zheng, Qingqing Luo. Pore evolution of the Permian Qixia-Maokou Formations dolomite in Sichuan Basin based on in-situ dissolution simulation experiment[J]. Oil & Gas Geology, 2021, 42(3): 702-716.

Figures/Tables 15

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样品编号	样品剖面位置	层位	岩性	流体成分	流体通量	温度/℃	压力/MPa
A	标准矿物	—	白云石	乙酸酐	不足	20~300	0~100
B	标准矿物	—	白云石	乙酸酐	适量	20~300	0~100
C	标准矿物	—	白云石	乙酸酐	过量	20~300	0~100
XBX-1-2	广元西北乡剖面	P₁q	粉晶白云岩	乙酸酐	不足	20~200	0~100
ZC-6	洪雅张村剖面	P₁m	残余颗粒白云岩	乙酸酐	不足	20~200	0~100
XJG-5	甘洛新基姑剖面	P₁q	中粗晶白云岩	乙酸酐	适量	20~300	0~100
LMH-1	落木河剖面	P₁q	残余生屑灰质粉晶白云岩	乙酸酐	过量	20~200	0~100

干酪根类型	实验热解生成有机酸类型及产率/%
干酪根类型	乙酸	草酸
Ⅰ型	2.17	0.24
Ⅱ型	2.01	0.15
Ⅲ型	0.53	—

模拟地层深度/km	白云石A				白云石B			白云石C
模拟地层深度/km	温度/℃	压力/MPa	温度/℃		压力/MPa		温度/℃	压力/MPa
0	20	79			20	52		20	186
2	60	81			60	117		60	243
4	100	177			100	151		100	311
6	140	236			140	262		140	385
8	180	393			180	336		180	445
10	220	460			220	373		220	537
12	260	496			260	420		260	641
14	300	648			300	471		300	693
模拟地层深度/km	XBX-1-2		ZC-6			XJG-5		LMH-1
模拟地层深度/km	温度/℃	压力/MPa	温度/℃	压力/MPa		温度/℃	压力/MPa	温度/℃	压力/MPa
0	20	0.1	20	0.1		20	0.1	20	449
1	40	0.1	40	—		40	0.1	40	414
2	60	0.1	60	3		60	0.1	60	389
3	80	—	80	10		80	—	80	—
4	100	44	100	16		100	43	100	375
5	120	77	120	23		120	—	120	—
6	140	114	140	34		140	93	140	467
7	160	151	160	56		160	—	160	526
8	180	191	180	82		180	124	180	—
9	200	231	200	105		200	190	200	—

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

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