Accumulation Mode and Development Countermeasures for  Limestone-Sandstone-Shale Reservoirs in Daanzhai Member, Yuanba Block

doi:10.3969/j.issn.1006-6535.2021.06.005

Abstract

Abstract: In order to investigate the distribution characteristics and combination patterns of the dense clast limestone-sandstone-shale mixed sedimentary reservoirs in Daanzhai Member, Yuanba Block, northeast Sichuan, the types of reservoirs and logging response characteristics of various reservoirs developed under the mixed sedimentary system in the target area were analyzed by means of core analysis, well logging interpretation, comprehensive geological study and mapping, the vertical and horizontal combination model and plane superposition model were established to characterize the distribution characteristics of the reservoirs, and the development potential and measures of natural gas in the study area were discussed. It was found in the study that Daanzhai Member in Yuanba Block is a mixed sedimentary system comprising ostracum beach, shallow lake mud, dam sand and beach sand, accompanied by the development of dense limestone, sandstone and shale reservoirs with distinct logging response characteristics, unequal quantity and strongly non-homogeneous distribution; five types of limestone-sandstone-shale reservoir assemblages and coincidence modes were identified in the longitudinal and transverse directions and planes respectively; the different reservoir assemblages had different gas resource potential; the key to the successful development of the limestone-sandstone-shale reservoir mode in Daanzhai Member, Yuanba block in northeast Sichuan was to optimize the technical combination and process flow of horizontal well drilling and staged fracturing. The results of this study can be used as a reference for the development of similar areas.

Key words: unconventional natural gas, hybrid reservoir model, integrated geological study, Daanzhai Member, Yuanba Block, development countermeasures

CLC Number:

TE122.1

Sun Tianli, Ou Chenghua, Guo Wei, Zhu Guo, Chen Wei, Zhang Zhiyue, Peng Shixuan, Yan Bo. Accumulation Mode and Development Countermeasures for Limestone-Sandstone-Shale Reservoirs in Daanzhai Member, Yuanba Block[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 36-44.

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Accumulation Mode and Development Countermeasures for Limestone-Sandstone-Shale Reservoirs in Daanzhai Member, Yuanba Block

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