Reservoir engineering geological characteristics and stimulation in Xujiahe Formation, Xinchang gas field, Western Sichuan Depression, Sichuan Basin

Huashu Zhu; Lin Liu; Zhiwen Huang; Xin Fan; Jincai Zhang

doi:10.11743/ogg20210420

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Reservoir engineering geological characteristics and stimulation in Xujiahe Formation, Xinchang gas field, Western Sichuan Depression, Sichuan Basin
Vol. 42, Issue 4, Pages: 1002-1010(2021)
Received：13 July 2021，

Published：28 August 2021
DOI： 10.11743/ogg20210420
稿件说明：

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DOI：

Huashu Zhu, Lin Liu, Zhiwen Huang, et al. Reservoir engineering geological characteristics and stimulation in Xujiahe Formation, Xinchang gas field, Western Sichuan Depression, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 1002-1010. DOI： 10.11743/ogg20210420.

摘要

储层增产技术是川西深层致密砂岩气藏开发的关键技术。川西坳陷新场气田须家河组二段为典型的深层致密砂岩气藏，具有储层致密、最小主应力与垂向应力接近的走滑断层应力状态以及储层裂缝发育等特点，前期储层改造效果不明显。针对须家河组储层开展了工程地质特征评价和前期压裂效果分析，在储层岩相、岩石学、物性和裂缝等特征研究基础上，将储层分为3大类地质工程双甜点类型。其中断缝体型甜点可通过氮气钻井、小规模试破和酸化建产，层理缝型甜点可通过近井深度解堵及复合改造工艺建产，孔隙型甜点需要通过超高压大规模体积压裂工艺实现建产。X8-2井主要钻遇断缝体型储层，通过氮气钻井测试获得稳定无阻流量达53×10

/d，而钻遇孔隙型甜点储层的XS101井可通过大规模体积压裂获得稳定产量（15×10

/d）。这些井的实践成功为川西坳陷须家河组天然气资源的有效动用提供了经济可行的增产技术对策。

Abstract

Reservoir sti

mulation is a key technology to develop the tight gas reservoir in the Western Sichuan Basin.The second member of the Xujiahe Formation (hereinafter referred to as T

)

a typical deep tight formation

is characterized by tightness

strike-slip fault stress state with minor principal stress close to vertical stress

and well-developed fractures within

and the effect of reservoir simulation is quite limited at the early stages.The engineering geological evaluation and analysis of the previous hydraulic fracturing operation in the Xujiahe Formation are carried out

and three types of "double sweet spots" (namely

the sweet spot both geologically and geomechanically) are determined based on lithofacies

petrology

physical properties and natural fractures.Among others

the fault-fracture type could be developed by nitrogen drilling

small-scale fracturing and acidizing; the bedding-parallel fracture type could be developed by the near-wellbore deep plugging removing and integrated stimulation technique; and the pore type needs to be fractured by volume fracturing under ultra-high pressure.In practice

Well X8-2 encountering fault-fracture type sweet spot achieves a steady open flow rate of 53×10

/d through nitrogen drilling

and Well XS101 encountering pore type sweet spots achieves a steady production rate of 15×10

/d through large-scale volume fracturing.The success of Wells X8-2 and SX101 shows that these technologies are effective in stimulation of the tight gas reservoirs

thus being applicable for the effective development of natural gas resources in the Xujiahe Formation

Western Sichuan Depression.

关键词

Keywords

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Characteristics of and main factors controlling the tight sandstone reservoir fractures in the 2nd member of Xujiahe Formation in Xinchang area, Western Sichuan Depression, Sichuan Basin

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Characteristics and distribution of "sweet spot" reservoirs in the third and fifth members of Upper Triassic Xujiahe Formation, Western Sichuan Depression, Sichuan Basin