Characteristics of In-Situ Stress in Sandy Conglomerate Reservoir of Badaowan Formation in District No.7, Karamay Oilfield

doi:10.7657/XJPG20200309

Abstract

Abstract:

The reservoir of Badaowan formation in District No.7 of Karamay oilfield is dominated by medium-coarse sandstone and conglomerate. The reservoir has been developed for a long time and remaining oil is widely distributed in the formation. In order to realize potential tapping in small layers and to reduce reservoir heterogeneity, separate-layer fracturing has been carried out. In the process of reservoir stimulation, some fractures penetrated interlayers and connected with water layer, resulting in poor stimulation effect. In order to understand rock mechanical characteristics and regional in-situ stress distribution, the paper establishes a 3D stress field model for the reservoir on the basis of lab core experiments and field data analysis. The stresses are almost the same in the southwestern and central part of the reservoir, the stress in the southeastern part is greatly influenced by fault and that in the southwestern part is influenced by fault gently. 5 reverse faults with large dip angle variations are developed in the study area and the stress mutation occurs at the junction of the faults, which will impact fracturing operation, therefore the operation parameters should be adjusted. The fractures in the southwestern and central reservoir extend upwards and downwards evenly. In the southeastern part of the reservoir, fractures tend to extend along the directions easily to stretch if encountering thick interlayers, so that the aquifer is connected, and fractures can easily penetrate thin interlayers. The fracture heights under the displacement of 2 m ³/min and 3 m ³/min are simulated and it is found that the fracture height under the displacement of 3 m ³/min is hard to be controlled due to the fracture’s large vertical extension and its connection with bottom water, and the fracture extension under the the displacement of 2 m ³/min can be controlled.

Key words: Karamay oilfield, Badaowan formation, reservoir, sandy conglomerate, interlayer, rock mechanics, in-situ stress field, reverse fault

CLC Number:

TE121

WANG Zhenyu, LIN Botao, YU Huiyong, SHI Shanzhi, KOU Xiangrong. Characteristics of In-Situ Stress in Sandy Conglomerate Reservoir of Badaowan Formation in District No.7, Karamay Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(3): 314-320.

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