川东北通江-马路背地区须家河组断缝体储层特征及成因

doi:10.11743/ogg20210409

Abstract

Abstract:

Affected by the superposition of multi-phase tectonic movements, the Xujiahe Formation in Tongjiang-Malubei area of the northeastern Sichuan Basin contains many sets of large-scale sand layers and special fault-fracture reservoirs in highly deformed structures.A study of reservoir characteristics, formation mechanisms and development control factors, in combination with drilling data and regional tectonic evolution for the formation, shows that the reservoirs are highly porous with well-developed fractures and feature in close relation between matrix pores and pore-fracture networks.The formation of fault-fracture reservoirs is closely linked to the triple-layer tectonic pattern and multi-phase tectonic movements in the area.The regional tectonic stress field and deep fluid activities serve respectively as the external mechanical background and internal genetic mechanism for the development of reservoirs.With source rock-rooted faults having dual functions of connecting source rock with reservoir and controlling the development of reservoirs, large-scale sand layers providing the basis for fracturing and dissolution, and local structures controlling the formation of complex fracture networks, the fault-fracture reservoirs with hydrocarbon came into being in the formation.

Key words: fault-fracture, source rock-rooted fault, tight sandstone, Xujiahe Formation, Tongjiang-Malubei area, Sichuan Basin

CLC Number:

TE122.2

Renchun Huang, Ruobing Liu, Ming Liu, Huanyu Cao, Sai Su, Hongquan Du. Characteristics and genesis of fault-fracture reservoirs in the Xujiahe Formation, Tongjiang-Malubei area, northeastern Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 873-883.

Figures/Tables 15

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Table 1

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裂缝类型	岩性	裂缝产状	裂缝开启性	延伸长度/cm	特征	有效性
断层相关裂缝	中-细砂岩	中-高角度	充填物多样，半充填	10~100	与断裂伴生，揉皱、擦痕与阶步发育	有效裂缝
褶皱相关裂缝	中-细砂岩	高角度	差异大，半充填-无充填	10~100	与褶皱伴生，裂缝呈组系	有效裂缝
砾石相关裂缝	砂砾岩	产状多样	充填物多样，全充填	< 10	裂缝发育受砾石控制	低效裂缝
顺层滑脱裂缝	泥岩	低角度-水平	充填物多样，全充填	< 10	顺层理面滑脱	无效裂缝

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Characteristics and genesis of fault-fracture reservoirs in the Xujiahe Formation, Tongjiang-Malubei area, northeastern Sichuan Basin

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