四川盆地安岳气田震旦系气藏叠合岩溶发育模式与主控因素

doi:10.11743/ogg20210604

Abstract

Abstract:

Comprehensive analyses of karst reservoir development characteristics and productivity testing of completed wells in the reservoirs of the Sinian Dengying Formation, Anyue gas field, Sichuan Basin, are combined with the development mechanisms for carbonate karst reservoirs to propose a concept and development model of superimposed karst and clarify their main controlling factors and effect on gas well performance. According to core, imaging data, reservoir space type, size and the configuration between fractures and cavities, the karst reservoirs are classified into three types: fracture-cavity type, pore-cavity type and pore type. High-quality reservoirs in the fourth member of the Dengying Formation in the field mostly belong to the first two types. Influenced by the differences in the initial lithology and physical properties of sedimentary strata and in paleogeomorphology characteristics during karst period, the karst reservoirs vary in terms of dissolution depth, vertical development locations and plane distribution range. A development model with differential dissolution for superimposed karst is thus proposed. It is also suggested that the sedimentary characteristics of microbial mounds and shoals, the overlapping two-stage weathering crust, the development scale of fault-fracture systems and the geological process of tectonic inversion control the development of superimposed karst reservoirs. Apart from that, superimposed karst development intensity also controls gas well performance. Based on these understandings, it is suggested a development priority on superimposed karst reservoirs in the basin. The study of development model and the controlling factors of these reservoirs is helpful in gas reservoir development evaluation, production area screening and well emplacement in the area.

Key words: development characteristic, development model, superimposed karst, carbonate gas reservoir, Dengying Formation, Sinian system, Anyue gas field, Sichuan Basin

CLC Number:

TE122.2

Xinhua Ma, Haijun Yan, Jingyuan Chen, Dongbo He, Wei Xu. Development patterns and constraints of superimposed karst reservoirs in Sinian Dengying Formation, Anyue gas field, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(6): 1281-1294, 1333.

Figures/Tables 12

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类型	典型井	岩心特征	薄片特征	成像测井特征
缝洞型	MX105井（5 325.2 ~ 5 325.4）m
孔洞型	MX105井（5 315.7 ~ 5 316.4）m
孔隙型	GS16井（5 425.8 ~ 5 453.2）m

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Development patterns and constraints of superimposed karst reservoirs in Sinian Dengying Formation, Anyue gas field, Sichuan Basin

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