地质科技情报2018，Vol.37Issue(3)：38-43,6.DOI:10.19509/j.cnki.dzkq.2018.0305
新疆中拐地区石炭系火山岩构造裂缝发育特征、期次及渗流特征
Development Characteristics, Formation Stages and Seepage Characteristics of Tectonic Fractures of Carboniferous Volcanic Rocks in Zhongguai Area, Xinjiang
摘要
Abstract
The properties of Carboniferous volcanic reservoirs in Zhongguai area are controlled by different stages of structural fractures, which have an important influence on the enrichment and productivity of oil and gas.It is of great significance to study the developmental characteristics of structural fractures, the formation phases and the seepage characteristics in order to provide evidence for effectively evaluating and developing the favorable reservoirs.There are mainly high-angle and oblique cross-joints in this area.The fractures develop in the orientations of near EW (270°±10°) , NW (300°±15°) , NE (45°±15°) and SN (0°±10°) .The research results of the compositions and cutting relations of fracture fillings, the homogenization temperature of the fracture packing inclusions and the acoustic emission test, combining with the tectonic evolution history suggest that the structural fractures in this area should be divided into at least four stages.The first stage of structural fractures was formed in the middle Hercynian tectonic movement.The filling was fine-grained calcite and chlorite.The homogenization temperature of the inclusions was 75-82℃ and the paleo-tectonic stress was 49.6 MPa.The second stage of structural fractures started in the Hercynian structure in the later period of movement.The filling was gypsum.The homogenization temperature of the inclusions was 92-97℃ and the paleo-tectonic stress was 39.9 MPa.The third-stage of tectonic fractures were formed during the Indo-Chinese tectonic movement, and the filling mainly consisted of coarse.The calcite and granulite homogenization temperature is 106-112 ℃, and the palaeotectonic stress is 34.1 MPa.The fourth stage of tectonic fractures happened during the Yanshanian tectonic movement.The fractures were barely filled during this period, and the palaeotectonic stress was 26.5 MPa.Affected by the current stress field, the near-EW fractures have a large opening and high permeability, which are the prior directions for the layout of well layout.With the development of oilfields, the dynamic changes of fracture permeability in different group systems are different and should appear in time with the corresponding well adjustment.关键词
发育特征/期次/构造裂缝/中拐地区/火山岩Key words
development characteristics/formation stages/structural fracture/Zhongguai area/volcanic rock分类
天文与地球科学引用本文复制引用
范存辉,李治,李虎,袁云峰,秦启荣,李朝旭..新疆中拐地区石炭系火山岩构造裂缝发育特征、期次及渗流特征[J].地质科技情报,2018,37(3):38-43,6.基金项目
构造与油气资源教育部重点实验室开放基金项目(TPR-2016-05) （TPR-2016-05）
