渤海湾盆地高尚堡深层低渗透断块油藏缝网系统及其主控因素

doi:10.11743/ogg20200310

Abstract

Abstract: The deep-buried,low-permeability fault block reservoir has considerable petroleum resource potential in Gao-shangpu oilfield,Bohai Bay Basin.The fracture network composed of hydraulic fractures and natural fractures controls the seepage performance of reservoirs after hydraulic fracturing.Analysis of the fracture network and its controlling factors is of great significance to developing the reservoir fracturing scheme and improving the development performance.In the study,an integration of core observation,imaging logging,stratigraphic dip logging and micro seismic monitoring data is applied to describe the development characteristics of natural and hydraulic fractures,as well in-situ stress,and to reveal the distribution pattern and major controlling factors of the fracture network in the study area.Results show that the reservoirs herein feature well developed natural fractures with high-angle shear fractures as the primary type,and the natural fractures were mainly developed under tectonic events during the Paleogene and the Late Neogene.The fractures therein can be divided into 3 groups,striking to NEE-SWW,NW-SE and near E-W respectively,with the first group,NEE-SWW-striking fractures being dominant.The dominant direction of maximum horizontal principal stress is N75°-85°E at present.Consequently,the NEE-SWW-trending natural fractures have the biggest aperture and the highest permeability under in-situ stress,acting as the main seepage channels.Hydraulic fractures are approximately vertical,with a primary orientation of N80°-90°E,as well as an average length and height of 136 m and 17.4 m,respectively.The distribution pattern of fracture network in the deep-buried fault block reservoir in Gaoshangpu oilfield is controlled by the coupling of hydraulic fractures with in-situ stress and natural fractures,while the controlling factors of fracture network growth are natural fractures,in-situ stress,and faults.

Key words: in-situ stress, fracture, fracture network, fault block reservoir, deep-buried Gaoshangpu oilfield, Bohai Bay Basin

CLC Number:

TE122.2

Wang Zhaosheng, Dong Shaoqun, Meng Ningning, Liu Daojie, Gao Wei. Fracture network in the low-permeability fault block reservoirs in deep-buried Gaoshangpu oilfield,Bohai Bay Basin,and its controlling factors[J]. Oil & Gas Geology, 2020, 41(3): 534-542,626.

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Fracture network in the low-permeability fault block reservoirs in deep-buried Gaoshangpu oilfield,Bohai Bay Basin,and its controlling factors

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