广西雪峰山南缘石炭系寺门组储层特征及其控制因素

doi:10.11743/ogg20220413

Abstract

Abstract:

The Carboniferous Simen Formation located at the southern margin of Xuefeng Mountain in Guangxi Zhuang Autonomous Region of China is of good hydrocarbon accumulation conditions. It is of great significance to finding out the formation and development mechanism and controlling factors of Simen Formation reservoirs regarding the petroleum exploration therein. An integration of field outcrop observation and various data including drilling and core， scanning electron microscopy （SEM）， casting thin section， inclusions， as well as porosity and permeability， is applied to clarify the basic characteristics of the Carboniferous Simen Formation reservoir at the southern margin of Xuefeng Mountain； and meanwhile the factors controlling reservoir development， formation mode of high-quality reservoirs， and distribution of play fairways are discussed. The research results show that the reservoir rocks of Simen Formation mainly include fine-grained quartzite sandstone and detrital quartzite sandstone， which are dominated by reservoir spaces of primary intergranular pores， secondary dissolved pores and fractures. The reservoirs are of the pore-fracture type and pore type， characterized by low porosity and low permeability as a whole. On the other hand， sedimentation， diagenesis and tectonism jointly control the reservoir quality， that is， microfacies of coastal sand bar， sandy-argillaceous shore and mixed flat control the distribution of reservoir sand bodies in the Simen Formation. Strong compaction is the primary cause for tight reservoirs， which could result in a pore loss rate of about 85.2 %， while dissolution effectively improves the reservoir quality （with a porosity rise of about 2.3 %）， and structural fractures greatly promote the carrier system of the reservoirs with some areas still favorable for the development of high-quality reservoirs in terms of physical conditions. Finally， a model for the reservoir development is established， by which two favorable areas for reservoir distribution of Desheng and Luobu counties are mapped in the study area.

Key words: reservoir characteristics, reservoir development model, play fairway distribution, tight sandstone, Simen Formation, Carboniferous, southern margin of Xuefeng Mountain

CLC Number:

TE122.2

Ziliang Liu, Minghe Zhang, Sibing Liu, Junjie Wang, Jingyu Hao, Yicai Chen, Yue Zhou. Reservoir characteristics and controlling factors of the Carboniferous Simen Formation at the southern margin of Xuefeng Mountain， Guangxi Zhuang Autonomous Region， China[J]. Oil & Gas Geology, 2022, 43(4): 902-916.

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地区	孔隙类型占比/%			总面孔率/%
地区	原生粒间孔	次生溶蚀孔	裂缝	总面孔率/%
西部地区	30	58	12	4.42
东部地区	33	61	6	2.96
东塘1井	13	72	15	1.93

类别	孔隙度/%	渗透率/（10^-3 μm²）	评价结果
Ⅰ类	>6	>0.8	较好储层
Ⅱ类	6～4	0.8～0.3	中等储层
Ⅲ类	4～2	0.3～0.1	较差储层
Ⅳ类	<2	<0.1	非储层

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Reservoir characteristics and controlling factors of the Carboniferous Simen Formation at the southern margin of Xuefeng Mountain， Guangxi Zhuang Autonomous Region， China

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