| 摘要: |
| 通过结合 “岩心测试-测井计算-地震属性”,构建高尚堡油田深层油藏南区(简称高深南区)三维非均质岩石力学场,并采用地质模型与有限元模型的无缝焊接技术,对高深南区现今地应力的三维空间分布进行研究,提出压裂优势区和压裂优势井段优选的建议。结果表明:高深南区最大水平主应力方向总体为NE-NEE向,地应力数值变化范围大,呈西低东高的分布趋势,并满足垂向主应力>最大水平主应力>最小水平主应力(SV>SHmax>Shmin),且Shmin为挤压应力,属于Ia类地应力状态;断层是影响高深南区应力场分布的最主要因素,造成地应力数值和方向在断层附近表现出显著异常,岩石力学参数是引起断块内地应力场差异的重要原因,主要影响地应力的数值,埋深与地应力数值呈较高的线性关系;高深南区部分井的油层段具备较低水平应力差的条件,是形成复杂缝网条件的压裂优势区;地质模型与有限元模型的无缝焊接技术发挥了Petrel软件与Ansys软件的优势,还原了目标区块形态,精细刻画了断层,体现了储层的非均质性,提高了预测精度,为类似复杂断块区地应力精细预测提供了参考,为低渗油藏高效开发提供了理论依据。 |
| 关键词: 复杂断块 三维非均质 现今地应力场 高尚堡油田 |
| DOI：10.3969/j.issn.1673-5005.2018.06.003 |
| 分类号::P 554 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(41572124)；国家科技重大专项(2016ZX05014002-006,2016ZX05047-003)；中央高校基本科研业务费专项(17CX05010,17CX06039) |
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| Prediction of current in-situ stress filed and its application of southern area of deep reservoir in Gaoshangpu Oilfield |
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XU Ke1, DAI Junsheng1, SHANG Lin2, FENG Jianwei1, FANG Lu3
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(1.School of Geoscience in China University of Petroleum(East China), Qingdao 266580, China;2.Exploration and Development Research Institute, Jidong Oilfield Company, Tangshan 063004, China;3.Exploration and Development Research Institute, Tarim Oilfield Company, Korla 841000, China)
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| Abstract: |
| Research on in-situ stress has important theoretical and practical significances in exploration and development of oil and gas reservoirs. Based on mechanical experiments, logging interpretation and seismic data, the spatial distribution of rock mechanics parameters was obtained. A 3D geological model and a 3D field of heterogeneous rock mechanics of the southern area of deep reservoir in Gaoshangpu Oilfield (the southern area of Gaoshen for short) were constructed. Petrel and Ansys modeling techniques were then used to study of the current in-situ stress field in the southern area of Gaoshen. The results indicate that the maximum horizontal stress orientation in the southern area of Gaoshen is generally NEE-trending, with significant changes in the in-situ stress orientation within and between fault blocks. Stress magnitudes are discrete along surfaces and profiles, showing lower value in the west and higher value in the east. Within the target layer, in-situ stress was categorized as Ia-type (Vertical principal stress>maximum horizontal principal stress>minimum horizontal principal stress>0, or SV>SHmax> Shmin>0). Faults are the most important factor causing large distributional differences in the stress field of reservoirs within the complex fault blocks. They have significant impacts on magnitudes and orientations in the stress field. Rock mechanic parameters impact on in-situ stress magnitudes. It is the main cause of differences of stress field in each fault block. A strong linear correlation exists between reservoir depth and in-situ stress magnitude. There is a smaller differential stress in part of wells in the southern area of Gaoshen, which easily forms a complex network of fractures. This technique exploits the advantages of Petrel and Ansys software and serves as a reference for studying the in-situ stress in regions with similar complex fault blocks. It also provides a basis for more efficient exploration and development of low-permeability reservoirs. |
| Key words: complex fault-block 3D heterogeneous current in-situ stress field Gaoshangpu Oilfield |
