Karst Identification and Influencing Factors on Carbonate Reservoir in Bozhong 22-1 Buried Hill Structure

doi:10.11885/j.issn.1674-5086.2019.11.25.01

Abstract

Abstract: The basic characteristics, karst identification and influencing factors of carbonate reservoir in buried hill were studied by means of core, thin section, imaging logging and other data. The results show that the lithology of the study area is mainly dolomite, limestone and transition rock. The reservoir space is dominated by dissolution holes, holes and fractures with an average porosity of 4.1%. The reservoir is mainly controlled by sedimentary facies, fractures and karsts. The sedimentary microfacies influence the dissolution degree, and the restricted platform facies and open platform facies are developed in the study area, among which the in-platform beach microfacies and cloud lagoon microfacies matrix pores are developed, which are conducive to the occurrence of dissolution. The improvement of reservoir space by fault and fracture system formed by tectonics is the early channel of karst. Karstification is the key to the formation of reservoirs. The karst structure in Well Ke2 was identified by core and imaging logging, and the influence depth of epigenic karst reaching 180 m below the unconformity surface. Under the control of karst cycle, there are four vertical percolation-horizontal subsurface flow zones, and the best physical property is the horizontal subsurface flow zone, which is a high-quality reservoir development zone.

Key words: carbonate rock buried hill, reservoir characteristics, imaging logging, karstification, influence factors, Bohai Bay, Bozhong 22-1 structure

CLC Number:

TE122

HOU Mingcai, CHEN Yang, WANG Yuechuan, GAO Kunshun. Karst Identification and Influencing Factors on Carbonate Reservoir in Bozhong 22-1 Buried Hill Structure[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1): 17-29.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2019.11.25.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I1/17

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