深部致密油储层现今地应力测井评价方法  

Logging assessment of deep tight sandstone oil reservoir current in situ stresses

作　　者：张建华 王改红[3] 尹帅 ZHANG Jian-hua;WANG Gai-hong;YIN Shuai(College of Safety Science and Engineering,Xi′an University of Sience and Technology,Xi′an 710054,China;Shaanxi Energy Institute, Xianyang 712000,China;CCDC Changqing Downhole Technology Company,Xi′an 710021,China;School of Earth Science and Engineering, Xi′an Shiyou University, Xi′an 710065, China)

机构地区：[1]西安科技大学安全科学与工程学院,西安710054 [2]陕西能源职业技术学院,陕西咸阳712000 [3]川庆钻探工程有限公司长庆井下技术作业公司,西安710021 [4]西安石油大学地球科学与工程学院,西安710065

出　　处：《桂林理工大学学报》2019年第2期362-368,共7页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(41572130)

摘　　要：利用测井资料进行现今地应力评价可以为压裂增产和水平井轨迹优化提供依据。以塔中S9井区志留系致密油为例,对目的层(S1k1)致密砂岩岩石力学性质及地应力进行综合研究及评价。从阵列声波测井资料中提取了致密油储层的纵横波时差,获得了动静态力学参数转换关系。通过引入修正系数C*至Newberry模型中,实现了对致密油储层水平方向最小主应力(σh)的计算。考虑到地应力的各向异性,引入非平衡结构因子(Ub),对储层水平最大主应力(σH)进行了测井计算。该测井解释模型的平均相对误差低于8%。古地磁、扩径分析及快横波方位分析结果表明,研究区目的层(S1k1)水平最大主应力方向为NE向。Current in situ stress assessment by logging data can provide a basis for fracturing stimulation and horizontal well optimization. Taking the Silurian tight oil from the S9 well block in Tazhong area as an example,we conduct a comprehensive logging assessment of the rock mechanical properties and in situ stresses. The transverse wave time difference of the tight oil reservoir was extracted by array acoustic logging, and the dynamic and mechanical parameters were obtained. By introducing the correction coefficient C~* to the Newberry model, the prediction of the minimum horizontal principal stress(σ_h) of the tight oil reservoir is realized. Considering the anisotropy of formation stress, the unbalanced structural factor(U_b) is introduced to evaluate the reservoir′s maximum horizontal principal stress(σ_H). The average relative prediction error of the logging interpretation model is less than 8%. By in situ stress orientation analysis for the target layer via the analysis of paleomagnetism, borehole enlargement and fast shear wave orientation, it was shown that the direction of the maximum horizontal stress is NE.

关 键 词：致密砂岩油储层 现今地应力 测井评价 Newberry模型 有效应力系数 

分 类 号：TE311[石油与天然气工程—油气田开发工程] P554[天文地球—构造地质学]