密度成像技术在南海西部油田地质导向中的应用
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Application of Density Imaging Technology in Geosteering in an Oilfield of the Western South China Sea
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    摘要:

    水平井施工过程中已广泛应用随钻地质导向技术,在持续发展储层随钻测绘等新技术过程中,密度成像技术在随钻地质导向技术中的应用仍然较为普遍。针对南海西部Z油田井控程度低、构造变化大、储层横向变化快等问题,引入了密度成像工具和相应的地质导向技术。借助高分辨率密度成像成果拾取精确的地层倾角,在此基础上分析落实构造形态,判断轨迹所处的相对位置;配合地质录井确定的岩性情况,避免局部相变造成的出层;从而为实时决策提供判断依据并指导地质导向。实施过程中首次提出并使用了过井轴视倾角的概念,改进了常规利用成像数据计算地层倾角的方法并通过实际对比验证;该区块目前已完钻4口水平井,平均长度580m,优质储层钻遇率80%。结论认为:在密度变化明显的构造+岩性油藏中使用该技术,能有效降低构造不确定性等地质风险,提高优质储层钻遇率。

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    The drilling geological guidance technology has been widely used in the process of horizontal well construction. In the process of continuous development of new technologies such as reservoir mapping-while-drilling, the application of density imaging technology in the drilling geological guidance technology is still relatively common. In view of the problems of low well control, large structural changes, and rapid lateral changes of reservoirs in the Z oilfield in the western South China Sea, density imaging tools and corresponding geosteering techniques were introduced. With the help of high-resolution density imaging results, the precise formation dip was picked up, and on this basis, the structural shape was analyzed and confirmed, and the relative position of the trajectory was judged. The lithology conditions were determined on the basis of geological logging to avoid layer breakout caused by local phase transformation, thus providing judgment basis for real-time decision-making and guiding geosteering. During the implementation process,the concept of the apparent dip angle through the well axis was proposed and used for the first time, and the conventional method of calculating the formation dip angle by using imaging data has been improved and verified by actual comparison. At present, 4 horizontal wells have been drilled in this block, with an average length of 580 m,and the drilling encounter rate of high-quality reservoirs is 80%. It is concluded that using this technology in the structure with obvious density changes and lithologic reservoirs can effectively reduce geological risks such as structural uncertainty and improve the drilling rate of high-quality reservoirs.

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王光,唐 宇,李茂文.密度成像技术在南海西部油田地质导向中的应用[J].重庆工商大学学报(自然科学版),2023,40(1):40-45
WANG Guang, TANG Yu, LI Maowen. Application of Density Imaging Technology in Geosteering in an Oilfield of the Western South China Sea[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2023,40(1):40-45

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  • 在线发布日期: 2023-02-21
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