热液活动对四川盆地中西部地区二叠系茅口组白云岩的影响

doi:10.11743/ogg20210310

Abstract

Abstract:

The hydrothermal dolostone in the Permain Maokou Formation of Sichuan Basin has been targeted frequently for natural gas during the past few years.Though quite common in the formation as a result of the Emeishan flood basalt eruption, hydrothermal activities and their effect on dolostone reservoirs are not sufficiently understood.Based on observation of outcrops, cores, and thin sections along with analysis of cathodoluminescence, homogenization temperature of fluid inclusions and geochemistry, we reached the following conclusions.Firstly, dolostone in the Maokou Formation can be divided into laminar dolostone and patchy dolostone.The former, the dominant type, can be further subdivided into very fine to fine-crystallized dolostone (D1) and fine to medium-crystallized dolostone (D2).The latter is composed of medium to coarse-crystallized dolomite (D3).Secondly, D2, mainly developed in D1 as patches, shows inequigranular texture and develops hydrothermal-related structures and minerals.Compared with D1, D2 has higher Fe and Mn content, stronger cathodoluminescence, higher homogenization temperature of fluid inclusions, higher ⁸⁷Sr/⁸⁶Sr, and more negative δ¹⁸ O_PDB value, indicating that D2 is generated by recrystallization of D1 under the influence of hydrothermal fluids.Thirdly, hydrothermal process can be both constructive and destructive to the development of Maokou Formation dolostone reservoirs.It is constructive in that hydrothermal activities led to the formation of rupture system and breccia, hydrothermal dissolution to dissolved pores and cavities, and hydrothermal metasomasis to dolomitization of limestone.It is destructive in that the physical properties of dolostone were affected by mineral sedimentation that plugged previously formed pores, ruptures, and cavities and by recrystallization that added more Mg²⁺ and CO₃^2- to the system.Lastly, the main driving force for the formation of reservoir space in the Maokou Formation is an early-stage meteoric freshwater dissolution, and the footprint of hydrothermal fluid can be seen as a clue to potential dolostone reservoirs.Therefore, importance shall be attached to shoal with early-stage dissolution during the exploration of Maokou Formation reservoirs in Sichuan.

Key words: hydrothermal fluid, laminar dolostone, patchy dolostone, recrystallization, Maokou Formation, Sichuan Basin

CLC Number:

TE122.2

Ting Li, Dancheng Zhu, Minglei Yang, Pingping Li, Huayao Zou. Influence of hydrothermal activity on the Maokou Formation dolostone in the central and western Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(3): 639-651.

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样品来源	岩性	层位	宏观产状	微观结构	晶体形态	晶体分布	δ¹⁸O(PDB)/‰	δ¹³C(PDB)/‰	⁸⁷Sr/⁸⁶Sr	Fe/10^-6	Mn/10^-6
丰都放牛坝剖面	白云岩	茅三段	层状	粉-细晶	自形	单峰	-3.3	4.3	0.707 701	268.1	22.0
	白云岩	茅三段	层状	粉-细晶	自形	单峰	-4.2	4.1	0.707 823	382.8	36.1
	白云岩	茅三段	层状	中晶	它形	单峰	-7.2	3.4	0.707 935	1 243.8	69.9
	白云岩	茅三段	胶结物	鞍状晶	它形	—	-10.9	4.0	0.710 186	1 145.4	127.6
	白云岩	茅三段	斑块状	中-粗晶	半自形	多峰	-9.3	4.2	0.709 122	2 235.7	98.9
	泥晶灰岩	茅三段	—	—	—	—	-4.6	3.8	0.707 384	135.0	21.0
华蓥二崖剖面	白云岩	茅二段	层状	细-中晶	半自形-自形	多峰	-7.2	3.2	0.707 975	861.7	59.6
	白云岩	茅二段	层状	细-中晶	半自形-自形	多峰	-6.8	3.8	0.707 838	457.1	49.1
	白云岩	茅二段	斑块状	中-粗晶	它形	单峰	-11.6	3.3	0.709 328	1 971.4	180.0
	白云岩	茅二段	胶结物	鞍状晶	它形	—	-11.4	3.9	0.709 595	1 006.0	180.1
	泥晶灰岩	茅二段	—	—	—	—	-4.1	4.2	0.707 095	258.8	39.3
泰来6井	白云岩	茅三段	层状	细-中晶	半自形	多峰	-7.6	3.1	0.708 167	319.4	57.7
	白云岩	茅三段	胶结物	鞍状晶	它形	—	-9.8	2.9	0.708 236	1 099.1	136.2
	白云岩	茅三段	层状	粉晶	自形	单峰	-3.9	4.2	0.707 508	316.7	46.3
	泥晶灰岩	茅三段	—	—	—	—	-5.0	3.9	0.707 403	165.2	9.8
邻水大坪剖面	白云岩	茅二段	层状	粉晶	自形	单峰	-4.9	3.6	0.707 702	283.7	28.6

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Influence of hydrothermal activity on the Maokou Formation dolostone in the central and western Sichuan Basin

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