新疆石油地质

›› 2013, Vol. 34 ›› Issue (4): 1-1.

• 论文 •    

宁合地区长7致密储集层天然裂缝发育特征

王晓东1，祖克威2，李向平1，赵向原2，唐小梅3，张阳宇2，朱利锋2   

  1. (1.中国石油 长庆油田分公司 油气工艺研究院,西安 710021;2. 中国石油大学 地球科学学院,北京 102249;3. 中国石油 长城钻探工程有限公司 测井技术研究院,北京 100101)
  • 出版日期:2019-01-01 发布日期:1905-07-12

The Characteristics of Natural Fractures in Tight Sandstone Reservoirs of Chang7 Member in Ningxian-Heshui Area, Ordos Basin

WANG Xiaodong1, ZU Kewei2, LI Xiangping1, ZHAO Xiangyuan2, TANG Xiaomei3, ZHANG Yangyu2, ZHU Lifeng2   

  1. (1.Research Institute of Drilling and Oil Production Technology, Changqing Oilfield Company, PetroChina, Xian, Shaanxi 710021, China;2.College of Earth Science, China University of Petroleum, Beijing 102249, China; 3.Research Institute of Well Logging Technology, Greatwall Drilling Company Ltd, PetroChina, Beijing 100101, China)
  • Online:2019-01-01 Published:1905-07-12

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摘要： 根据露头、岩心和成像测井等资料研究认为，鄂尔多斯盆地宁县—合水地区延长组长7致密储集层发育构造裂缝和成岩裂缝，高角度构造裂缝为主要裂缝类型。高角度剪切裂缝有东西向、南北向、北西—南东向和北东—南西向4组，其中以北东—南西向和东西向为主。裂缝发育程度受控于岩性、层厚、沉积微相和岩层非均质性等因素，其中，非均质性是主要因素。长7致密储集层天然裂缝发育，受现今地应力影响，北东—南西向裂缝会优先启动，成为主要的渗流通道，同时岩石脆性指数高，有利于体积压裂，形成复杂的裂缝网络系统。

Abstract: Based on the data of outcrops, cores and imaging logs, structural fractures and diagenetic fractures develop in the tight sandstone reservoirs of Chang?7 member of Yanchang formation in Ningxian-Heshui area in Ordos basin, of which the high?angle shear fractures are dominant, with four sets of orientations like EW, SN, NW-SE and NE-SW, dominated by NE-SW and EW fractures. The big variation of fractures is affected by the lithology, bedding thickness, sedimentary micro?facies and rock heterogeneity, among which the rock heteroge?neity is the main factor affecting such a reservoir’s fracture development degree. Also, the development of natural fractures of Chang?7 member is subjected to the effect of current stress field. The preferential open NE-SW fracture system will be the main seepage channels.The high rock brittleness index is favorable for volumetric fracturing, forming complex fracture network system in it

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