地质力学学报2018，Vol.24Issue(3)：321-331,11.DOI:10.12090/j.issn.1006-6616.2018.24.03.034
徐家围子断陷深层火石岭组致密火山岩储层地应力分布规律研究
RESEARCH ON GROUND STRESS DISTRIBUTION RULES OF DEEP TIGHT VOLCANIC ROCK RESERVOIRS IN THE HUOSHILING FORMATION, XUJIAWEIZI FAULT DEPRESSION
摘要
Abstract
The XujiaweiziFault Depression is located in the north of the Songliao basin, and its deep Mesozoic Huoshiling formation is a dense volcanic gas reservoir with natural fracture development and strong heterogeneity of the stress distribution.The present ground stress orientation of single well is analyzed by induced fracture method and well diameter caving method, and the longitudinal distribution of present ground stress is calculated by acoustic logging method.The heterogeneous three-dimensional geological model is established according to the top-and-bottom surface maps, volcanic facies groups and fault distribution characteristics of the Huoshiling Formation.Based on the fitting and correction of dynamic and static rock physical parameters, the physical parameters of different lithofacies groups and fault rocks are determined in combination with experimental tests and existing research results, and the three-dimensional mechanical model is established.Ansys finite element numerical simulation software is used to establish the three-dimensional mathematical model of the Huoshiling Formation and to obtain the three-dimensional present ground stress distribution model by correlative calculation.The calculated results show that in the Huoshiling Formation the preferred orientation of the maximum horizontal principal stress is EW, with the stress values range from 86 to 110 MPa, and the minimum horizontal principal stress preferred orientation is SN, with the stress values range from 67 to 84 MPa.The simulation results show that the volcanic facies, characteristics of faults and structural relief have great influences on the present ground stress of the Huoshiling Formation, Xujiaweizi Fault Depression.Among them the horizontal principal stress orientation is greatly affected by the distribution of faults and the near-crater facies, while the value of the horizontal principal stress is controlled by them three.The horizontal stress in the lower position of the depression, the near crater facies and the fault ends are high.The results of present ground stress can provide important guidance for the next-stage of well networks arrangement, fracturing reformation scheme, horizontal well design and water injection management in the Xujiaweizi Fault Depression.关键词
现今地应力/岩石物理参数/火山岩储层/数值模拟/火石岭组/徐家围子断陷Key words
present ground stress/rock physical parameters/volcanic reservoir/numerical modeling/the Huoshiling Formation/the Xujiaweizi Fault Depression分类
天文与地球科学引用本文复制引用
毛哲,曾联波,秦龙卜,祖克威,刘国平,田鹤..徐家围子断陷深层火石岭组致密火山岩储层地应力分布规律研究[J].地质力学学报,2018,24(3):321-331,11.基金项目
国家科技重大专项(2017ZX05009001) （2017ZX05009001）
