变质岩潜山储集层有效性评价

doi:10.11743/ogg20150509

Abstract

Abstract: Evaluation of effectiveness of crystalline basement buried hill reservoirs has long been a difficult geological problem.In this paper,JZ25-1S metamorphosed basement buried hill in Bohai Bay Basin is taken as an example.First,fracture characteristic parameters are studied by using various data such as core,thin section,well logging,production test and experimental analysis.Then,the effectiveness of fractures and matrix in the buried hill reservoirs are evaluated based on the analysis of both dynamic data and static data.The research results show that fractures are highly developed in JZ25-1S and their effectiveness is high.The most effective fractures are open oblique fractures which are formed in later period,followed by the half-filled and full-filled vertical fractures,and the worst fractures are the filled horizontal fractures which are formed in early period.With the characteristics of rock physics,PLT and core centrifuge test,the lower limits of physical properties in buried hill reservoirs are determined.By using static imbibition experiment,it is possible to quantitatively evaluate the development potential of Matrix system.Capillary force is the main driving force for drainage process in matrix blocks.And the main factors influencing drainage process are the distribution and growth level of micro-fractures.

Key words: fracture system, matrix system, metamorphosed basement buried hill, effectiveness of reservoirs, Bohai Bay Basin

CLC Number:

TE122.2

Tong Kaijun, Cheng Qi, Nie Lingling, Fang Na. Evaluation of effectiveness of metamorphosed basement buried hill reservoirs[J]. Oil & Gas Geology, 2015, 36(5): 780-787.

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Evaluation of effectiveness of metamorphosed basement buried hill reservoirs

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