四川盆地南部中二叠统茅口组碳酸盐岩岩溶特征:古大陆环境下层控型早成岩期岩溶实例

doi:10.7605/gdlxb.2015.04.038

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Abstract

By use of drilling, logging,core,and thin section data,the karst characteristics of carbonate rocks of the Middle Permian Maokou Formation in southern Sichuan Basin are studied. Maokou Formation,a deposition of open-sea platform,is characterized by the interbedding of grainstone of bank facies and micrite limestone of non-bank facies with unequal thickness. The karst is mainly developed at the upper part of Maokou Formation,with a large amount of dissolved fissures and caves overwhelmingly filled by substances from various sources including dissociated carbonate fragments,calcite crystals and carbonous clays,and no sign of karst breccia. The karstification belongs to eogenetic karst in palaeo-continental settings,which is significantly featured by the dissolution-filling controlled by its lithology and lithofacies:Micrite limestone within non-bank facies is compact,and shows little sign of dissolution-filling,while grainstone within bank facies is characterized by good karst development,and three zones of dissolution-filling can be recognized including matrix,half-dissociated and mixed-filling zones. Based on the above characteristics,it is suggested that high porosity-permeability layers of grainstone and compact ones of micrite limestone were multi-cycle superimposed vertically,and primary porosity-permeability system accompanied by faults and fissures provided sufficient channels for karst water,which resulted in the whole karst system featured by contemporaneous mult￣layer and grain￣bank facies controlled. The karst reservoir, therefore,favored to develop in both karst platform and karst slope. The research result will not only provide supplement and reference for the existing studies of the subject,but also is of meaning to the oil and gas exploration of Maokou Formation.

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	Articles by authors
	Xiao Di
	Tan Xiucheng
	Xi Aihua
	Liu Hong
	Shan Shujiao
	>Xia Jiwen
	Cheng Yao
	Lian Chengbo

Key words： karst strata-bound grain-shoal-facies-controlled Permian Sichuan Basin

Received: 20 December 2014 Published: 01 August 2015

ZTFLH:

P588.24＋5

Corresponding Authors: Tan Xiucheng,born in 1970,is a professor and doctorial tutor of Southwest Petroleum University. He is mainly engaged in reservoir sedimentology. E-mail: tanxiucheng70@163.com.

About author: Xiao Di,born in 1989,is a Ph.D. candidate of Southwest Petroleum University. He is mainly engaged in reservoir geology. E-mail: super_xd_mm@126.com.

Cite this article:

Xiao Di,Tan Xiucheng,Xi Aihua et al. Palaeokarst characteristics of carbonate rocks of the Middle Permian Maokou Formation in southern Sichuan Basin:Example of strata-bound eogenetic karst in palaeo-continental settings[J]. JOPC, 2015, 17(4): 457-476.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2015.04.038 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2015/V17/I4/457

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