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地质科学  1978, Vol. 13 Issue (3): 203-219    DOI:
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四川盆地南部二叠系茅口组碳酸岩岩石学与储集性质
戴永定1, 李菊英1, 蒋协光1, 赵生才1, 侯奎1, 黄华樑2, 肖起予2
1. 中国科学院地质研究所;
2. 四川石油局地质勘探开发研究院
PETROGRAPHY OF CARBONATE ROCKS FROM THE PERMIAN MOUKOU FORMATION AND THEIR RESERVOIR PROPERTIES IN SOUTHERN SICHUAN BASIN
Dai Yongding1, Li Juying1, Jiang Xieguang1, Zhao Shengcai1, Hou Kui1, Huang Hualiang2, Xiao Qiyu2
1. Institute of Geology, Academia Sinica;
2. Research Institute of Geological Exploration and Development, Sichuan Petroleum Administration
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摘要 

概述茅口组沉积时,四川盆地为一沉积碳酸盐的浅海台地,东北与已上升为陆的中朝陆台毗邻。北有秦岭、西有康滇、东南有雪峰等古陆呈岛链孤立于广阔浅海中。有的已经沉没水中。海水来自特提斯海,从西和西南进入本区,再向东流入杨子海槽。陆源物质主要来自中朝陆台和邻近古陆。

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Abstract

Based upon detailed research on the bioclastic limestones of Moukou formation in southern Sichuan basin, a scheme of classification is proposed. And their stages of diagenetic changes were also analyzed. The character of reservoir voids in the bioclastic limestones is roughly discussed, which emphasized the affect of various lithologic factors on the reservoir property. Finally, the reservoir regularity of gas in this limestone is stated as follows.(1) Intercrystal pore of sparry calcite and dolomite behaved as the main reservoir space. The cavern of the karst system and adjacent pore may be regarded as enriched space, maintaining the stability of production. It was realized that fracture fissures were the main background of high gas production.(2) The sparitic red algal limestone and dolomitic echinodermatic limestone play an important role in reservoir capacity, while the micritic shelly green algal limestone and shelly marlite are the main resource rocks. Obviously, the organism, especially the algae, is the chief factor in the formation of oil-gas reservoir.(3) Bed algal bans occurred in uplifted plarform margin is the main reservoir facies, which appear to be more promising in the reservoir behavior, especially those occured near the margin of open sea. And the semi-closed lagoon within subsidence basin is found to be the main resource facies with favourable lithological character on the side of green algal bank. Hence, the transitional belt between the uplifted platform and the subsidence basin is considered as the most available facies zone for gas exploration.(4) In general, the recrystallization, karst development and dolomization can improve the reservoir capacity of strata, while the existence of muddy constituents may reduce the reservoir capability. During the period after the sedimentation of Moukou formation and before the sedimentation of Leping formation, there occurred an epeirogenetic uplift, accompanying the development of paleokarst.(5) Bioclastic limestone of Moukou formation is overlain by Leping coal-series, the oil (gas) originated in the Lower part and reserved in its upper part. Thus a self-generate and self-reserving gas-containing formation with large reservoir and production capacity were formed.

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引用本文:   
. 1978, 四川盆地南部二叠系茅口组碳酸岩岩石学与储集性质. 地质科学, 13(3): 203-219.
. PETROGRAPHY OF CARBONATE ROCKS FROM THE PERMIAN MOUKOU FORMATION AND THEIR RESERVOIR PROPERTIES IN SOUTHERN SICHUAN BASIN[J]. Chinese Journal of Geology, 1978, 13(3): 203-219.
 
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