四川盆地中二叠统热液白云岩化作用及其储层改造意义

doi:10.11743/ogg20210603

Abstract

Abstract:

The Middle Permian in the Sichuan Basin hosts various types of hydrothermal dolomites that are important to oil and gas exploration. Their mechanisms and occurring models as well as their contribution to reservoir quality enhancement have been the focus of study for years but a consensus is yet to be reached. This paper summarizes the mechanisms and their role in shaping reservoirs through detailed mineralogical, petrographic and geochemical analyses of hydrothermal dolomites from typical locations in the Sichuan Basin. The results show that the hydrothermal dolomitization in the Middle Permian of the Sichuan Basin is mainly related to contemporaneous fault activities and has no obvious correlation with the lithology and lithofacies of surrounding rocks. According to the relationship between hydrothermal dolomites and surrounding rocks, the hydrothermal dolomitization possibly occurs in three models: (1) hydrothermal dolomitization from modification of grain-beach facies, mainly occurring in the Qixia Formation of western and central Sichuan Basin and has no significant contribution to the improvement of reservoirs; (2) hydrothermal dolomitization from modification of karstified limestone, mainly occurring in the Maokou Formation of central Sichuan Basin and is insignificant in contributing to reservoir quality enhancement; and (3) hydrothermal dolomitization from modification of tight limestone, mainly occurring in the Maokou Formation of eastern Sichuan Basin and has contributed greatly to reservoir property improvement. Fault-related fractures, residual dissolution pores and dolomite intercrystalline pores constitute most storage space in reservoirs with hydrothermal dolomitization. Compared with reservoirs with relatively good initial physical properties, the reservoirs with poor initial physical properties are even more significant in terms of quality enhancement after hydrothermal dolomitization and relevant structural activities.

Key words: hydrothermal dolomite, reservoir, Qixia Formation, Maokou Formation, Middle Permian, Sichuan Basin

CLC Number:

TE122.2

Shuangjian Li, Tianbo Yang, Yueqing Han, Ping Gao, Yujin Wo, Zhiliang He. Hydrothermal dolomitization and its role in improving Middle Permian reservoirs for hydrocarbon accumulation, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(6): 1265-1280.

Figures/Tables 10

Fig.1

Table 1

Thickness of the Middle Permian dolomites, Sichuan Basin"

剖面或钻井	白云岩厚度/m	成因	资料来源	剖面或钻井	白云岩厚度/m	成因	资料来源
女基	25.0	热液	陈轩等，2012^[14]	卧67	23.0	-	韩晓涛等，2016^[22]
汉深1	62.0	热液	陈轩等，2013^[19]	广探2	31.0	热液	刘宏等，2016^[15]
大邑大飞水	5.0	热液	张文等，2014^[20]	周公1	50.5	热液	胡安平等，2018^[23]
宝兴西大河	70.0	热液	张文等，2014^[20]	江油五花洞	23.0	-	胡安平等，2018^[23]
华蓥山二崖	28.0	-	张文等，2014^[20]	广参2	25.0	热液	胡安平等，2018^[23]
华蓥山西天	10.0	-	张文等，2014^[20]	双探3	23.0	-	胡安平等，2018^[23]
新开寺	37.0	热液	张文等，2014^[20]	大深1	96.4	热液	胡安平等，2018^[23]
汉6	78.0	-	张文等，2014^[20]	汉1	112.0	热液	胡安平等，2018^[23]
油1	4.0	-	张文等，2014^[20]	磨溪39	20.0	-	胡安平等，2018^[23]
华蓥山地质公园	15.0	-	张文等，2014^[20]	南充1	16.0	-	胡安平等，2018^[23]
张村	84.0	热液	张文等，2014^[20]	七里23	18.4	-	张坤贞等，2019^[24]
广元杨家崖	31.0	-	张文等，2014^[20]	雷西1	4.8	-	张坤贞等，2019^[24]
广元长江沟	34.0	热液	张文等，2014^[20]	川付85	10.6	-	张坤贞等，2019^[24]
广元上寺	30.0	-	张文等，2014^[20]	川岳84	22.0	-	张坤贞等，2019^[24]
广元车家坝	5.0	热液	张文等，2014^[20]	普光5	11.6	-	张坤贞等，2019^[24]
广元西北乡	42.0	热液	张文等，2014^[20]	毛坝3	5.0	-	张坤贞等，2019^[24]
河6	5.0	-	张文等，2014^[20]	明1	26.0	-	张坤贞等，2019^[24]
卧115	26.0	热液	张文等，2014^[20]	雷北1	11.5	-	张坤贞等，2019^[24]
卧85	10.5	热液	张文等，2014^[20]	清溪3	16.8	-	张坤贞等，2019^[24]
通口	27.5	-	张文等，2014^[20]	泰来6	23.0	热液	胡东风等，2019^[25]
天井山阴泉山	5.0	-	张文等，2014^[20]	宝兴五龙	34.5	热液	本项目实测
松盖坪	9.0	-	张文等，2014^[20]	旺苍正源	4.0	-	本项目实测
绵竹高桥	15.5	-	张文等，2014^[20]	丰都放牛坝	25.0	热液	本项目实测
旺苍王家沟	1.7	-	张文等，2014^[20]	阆中1	25.0	-	井资料
吴家1	31.0	热液	张文等，2014^[20]	川深1	15.0	热液	井资料
矿2	44.0	热液	张文等，2014^[20]	永兴1	15.0	热液	井资料
双探1	22.0	-	宋晓波等，2016^[21]	关基	8.0	-	井资料

Table 1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

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Hydrothermal dolomitization and its role in improving Middle Permian reservoirs for hydrocarbon accumulation, Sichuan Basin

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