Prediction of Structural Fracture Characteristics of Carbonate Reservoir in Leikoupo Formation of Pengzhou Gas Field

doi:10.3969/j.issn.1006-6535.2024.06.003

Abstract

Abstract: To address the issue of the ambiguous understanding of the distribution characteristics and development degree of structural fractures in Leikoupo Formation of Pengzhou Gas Field,taking into account the influence of sedimentary microfacies,layer thickness and bedding plane,a prediction approach of structural fractures in carbonate strata based on engineering geomechanics was established.Taking the fourth member of Leikoupo Formation in PZ-6 well area as an example,the finite element method was employed to assess the trans-scale structural fractures of the well area and individual wells.The results demonstrate that the structural fractures in the well area are mainly oblique fractures,and the fracture linear density in the fault area is approximately 1.3 per metre.The fracture line density of algal dolomite flat and dolomite lime flat is greater than that of other sedimentary microfacies.The relative error between the statistical results and the prediction results of fracture line density in the well area is 6.83%,and the well location can be preferentially deployed in the above two sedimentary microfacies.The prediction results of structural fractures in single wells are in accordance with the logging results by 91.23%,and the formation fracture coefficient at the bedding plane is greater than 1.2,indicating that the structural fractures at the bedding plane are more developed.The thin layer is influenced by the layer,and the principal stress change is more obvious.During the construction,well leakage can be prevented in accordance with the distribution of single well structural fractures.The research results are of great significance to clarify the distribution characteristics of structural fractures,optimal selection of horizons and well location deployment in Leikoupo Formation of Pengzhou Gas Field.

Key words: Pengzhou Gas Field, Leikoupo Formation, structural fractures, sedimentary microfacies, three-dimensional stress field

CLC Number:

TE122.3

Li Gao, Liang Binbin, Xie Qiang, He Long, Shangguan Ziran, Yang Xu. Prediction of Structural Fracture Characteristics of Carbonate Reservoir in Leikoupo Formation of Pengzhou Gas Field[J]. Special Oil & Gas Reservoirs, 2024, 31(6): 24-31.

References

[1] 王琼仙,宋晓波,王东,等.川西龙门山前雷口坡组四段储层特征及形成机理[J].石油实验地质,2017,39(4):491-497.
WANG Qiongxian,SONG Xiaobo,WANG Dong,et al.Reservoir characteristics and formation mechanism of the 4th member of the Leikoupo Formation in Longmen Mountain front[J].Petroleum Geology & Experiment,2017,39(4):491-497.
[2] 肖开华,李宏涛,段永明,等.四川盆地川西气田雷口坡组气藏储层特征及其主控因素[J].天然气工业,2019,39(6):34-44.
XIAO Kaihua,LI Hongtao,DUAN Yongming,et al.Reservoir characteristics and main controlling factors of the Leikoupo gas pools in the western Sichuan Basin[J].Natural Gas Industry,2019,39(6):34-44.
[3] 李书兵,许国明,宋晓波.川西龙门山前构造带彭州雷口坡组大型气田的形成条件[J].中国石油勘探,2016,21(3):74-82.
LI Shubing,XU Guoming,SONG Xiaobo.Forming conditions of Pengzhou large gas field of Leikoupo Formation in Longmenshan piedmont tectonic belt,western Sichuan Basin[J].China Petroleum Exploration,2016,21(3):74-82.
[4] 张艳博,徐加祥,刘哲,等.二级裂缝倾角对复杂缝网中支撑剂输送的影响[J].大庆石油地质与开发,2023,42(1):91-99.
ZHANG Yanbo,XU Jiaxiang,LIU Zhe,et al.Effect of secondary fracture dip on proppant transport in complex fracture network[J].Petroleum Geology & Oilfield Development in Daqing,2023,42(1):91-99.
[5] 张继尹,肖国益,李玉飞,等.金马—鸭子河构造带超深井钻井技术难点及对策[J].钻采工艺,2017,40(4):113-115.
ZHANG Jiyin,XIAO Guoyi,LI Yufei,et al.Drilling technical difficulties and countermeasures of ultra-deep wells in Jinma-Yazihe structural belt[J].Drilling & Production Technology,2017,40(4):113-115.
[6] 王汉卿,胡大梁,黄河淳,等.川西气田雷口坡组气藏超深大斜度井钻井关键技术[J].断块油气田,2020,27(4):513-516.
WANG Hanqing,HU Daliang,HUANG Hechun,et al.The key drilling technology of ultra-deep highly deviated well in Leikoupo gas reservior,western Sichuan Basin[J].Fault-Block Oil & Gas Field,2020,27(4):513-516.
[7] 丁士东,赵向阳.中国石化重点探区钻井完井技术新进展与发展建议[J].石油钻探技术,2020,48(4):11-20.
DING Shidong,ZHAO Xiangyang.New progress and development suggestions for drilling and completion technologies in sinopec key exploration areas[J].Petroleum Drilling Techniques,2020,48(4):11-20.
[8] 熊婷,贾春明,妥军军,等.基于正演模拟的最大似然法火山岩有效裂缝识别及预测[J].特种油气藏,2021,28(5):30-36.
XIONG Ting,JIA Chunming,TUO Junjun,et al.Identification and prediction of effective fractures in volcanic rocks by maximum likelihood method based on forward modeling[J].Special Oil & Gas Reservoirs,2021,28(5):30-36.
[9] 季宗镇,戴俊生,汪必峰.地应力与构造裂缝参数间的定量关系[J].石油学报,2010,31(1):68-72.
JI Zongzhen,DAI Junsheng,WANG Bifeng.Quantitative relationship between crustal stress and parameters of tectonic fracture[J].Acta Petrolei Sinica,2010,31(1):68-72.
[10] 商琳,戴俊生,贾开富,等.碳酸盐岩潜山不同级别构造裂缝分布规律数值模拟——以渤海湾盆地富台油田为例[J].天然气地球科学,2013,24(6):1260-1267.
SHANG Lin,DAI Junsheng,JIA Kaifu,et al.Numerical simulation for the distribution of different levels of tectonic fractures in carbonate buried hills:taking Futai Oilfield in Bohai Bay Basin as an example[J].Natural Gas Geoscience,2013,24(6):1260-1267.
[11] 刘建,惠晨,樊建明,等.鄂尔多斯盆地合水地区长6致密砂岩储层构造地应力分布特征及其开发建议[J].地质力学学报,2021,27(1):31-39.
LIU Jian,HUI Chen,FAN Jianming,et al.Distribution characteristics of the present-day in-situ stress and suggestions for development in the Chang 6 tight sandstone reservoirs of the Yanchang Formation in the Heshui Area,Ordos Basin,China[J].Journal of Geomechanics,2021,27(1):31-39.
[12] 董敏,郭伟,张林炎,等.川南泸州地区五峰组—龙马溪组古构造应力场及裂缝特征[J].岩性油气藏,2022,34(1):43-51.
DONG Min,GUO Wei,ZHANG Linyan,et al.Characteristics of paleotectonic stress field and fractures of Wufeng-Longmaxi Formation in Luzhou Area,southern Sichuan Basin[J].Lithologic Reservoirs,2022,34(1):43-51.
[13] KHAIR H A,COOKE D,HAND M.Paleo stress contribution to fault and natural fracture distribution in the Cooper Basin[J].Journal of Structural Geology,2015,79:31-41.
[14] GUO P,REN D,XUE Y.Simulation of multi-period tectonic stress fields and distribution prediction of tectonic fractures in tight gas reservoirs:a case study of the Tianhuan Depression in western Ordos Basin, China[J].Marine and Petroleum Geology,2019,109:530-546.
[15] REN Q,JIN Q,FENG J,et al.Geomechanical models for the quantitatively prediction of multi-scale fracture distribution in carbonate reservoirs[J].Journal of Structural Geology,2020,135:104033.
[16] FENG J,SHI S,ZHOU Z,et al.Characterizing the influence of interlayers on the development and distribution of fractures in deep tight sandstones using finite element method[J].Journal of Structural Geology,2019,123:81-95.
[17] SHUAI Yin,QIANG Jia,WEN Longding,et al.3D paleotectonic stress field simulations and fracture prediction for marine-continental transitional facies forming a tight-sandstone reservoir in a highly deformed area[J].Journal of Geophysics and Engineering, 2018,15(4):1214-1230.
[18] 杨永红,冯建伟,张鹏飞.含夹层致密砂岩储层裂缝发育规律[J].地球科学前沿,2018,8(2):431-446.
YANG Yonghong,FENG Jianwei,ZHANG Pengfei.Control action research on fracture development in tight sandstone by the lithologic interfaces[J].Advances in Geosciences,2018,8(2):431-446.
[19] 商琳,戴俊生,冯建伟,等.砂泥岩互层裂缝发育的地层厚度效应[J].新疆石油地质,2015,36(1):35-41.
SHANG Lin,DAI Junsheng,FENG Jianwei,et al.Effect of strata thickness on fracture development in sand-mud interbed[J].Xinjiang Petroleum Geology,2015,36(1):35-41.
[20] 徐珂,戴俊生,商琳,等.高尚堡油田深层油藏南区构造地应力场预测及应用[J].中国石油大学学报(自然科学版).2018,42(6):19-29.
XU Ke,DAI Junsheng,SHANG Lin,et al.Prediction of current in-situ stress filed and its application of southern area of deep reservoir in Gaoshangpu Oilfield[J].Journal of China University of Petroleum(Edition of Natural Science).2018,42(6):19-29.
[21] 王硕,戴俊生,王珂,等.基于数值模拟分析构造作用对裂缝发育的控制[J].特种油气藏,2016,23(1):76-80.
WANG Shuo,DAI Junsheng,WANG Ke,et al.Analysis on the control of tectonism to fracture development based on numerical simulation[J].Special Oil & Gas Reservoirs,2016,23(1):76-80.