密度投影技术在页岩裂缝储层预测中的应用——以渤南洼陷罗家地区沙三段下亚段为例
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摘要
针对页岩储层预测及描述的难点,采用非高斯信号、非平稳信号、非线性信号和高阶统计量等现代信号分析方法,开发出密度投影技术。该项技术的前提条件是优选能有效表征裂缝储层的分形、伪熵和混沌等地震属性,对多种地震属性表征的有利裂缝储层展布情况进行融合显示,既可避免单一地震属性的多解性,也可以实现"甜点"预测并对储层分类分级进行评价,进一步完善了储层预测技术系列。利用密度投影技术对渤南洼陷罗家地区沙三段下亚段页岩裂缝储层进行预测,将其裂缝储层划分为Ⅰ类储层、Ⅱ类储层和非储层3类,获得较高产能的井均位于有利裂缝储层(Ⅰ类和Ⅱ类储层)发育区,预测结果与实钻结果吻合率较高。
With the improvement degree of exploration and the increasing difficulty of development, we need more geophysical techniques than before. In order to solve the difficulty in prediction of fractured shale reservoirs, we develop a new technique named density projection using the method of modern signal analysis. It can not only display many attributes overlay but also avoid the problem of multi-solution. It can further perfect the technology series of reservoir prediction. The technique has been applied in the lower Es3 of Luojia region of Bonan sag of Shengli oilfield, and obtained a good result. It can guide us to understand the distributing of fractured reservoirs and help us to deploy horizontal wells.
With the improvement degree of exploration and the increasing difficulty of development, we need more geophysical techniques than before. In order to solve the difficulty in prediction of fractured shale reservoirs, we develop a new technique named density projection using the method of modern signal analysis. It can not only display many attributes overlay but also avoid the problem of multi-solution. It can further perfect the technology series of reservoir prediction. The technique has been applied in the lower Es3 of Luojia region of Bonan sag of Shengli oilfield, and obtained a good result. It can guide us to understand the distributing of fractured reservoirs and help us to deploy horizontal wells.
引文
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[2]闫存章,黄玉珍,葛春梅,等.页岩气是潜力巨大的非常规天然气资源[J].天然气工业,2009,29(5):1-6.
[3]王永诗,巩建强,房建军,等.渤南洼陷页岩油气富集高产条件及勘探方向[J].油气地质与采收率,2012,19(6):6-10.
[4]邹才能,董大忠,王社教,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653.
[5]陈尚斌,朱炎铭,王红岩,等.中国页岩气研究现状与发展趋势[J].石油学报,2010,31(4):689-694.
[6]向立宏.济阳坳陷泥岩裂缝主控因素定量分析[J].油气地质与采收率,2008,15(5):31-37.
[7]宋梅远,张善文,王永诗,等.沾化凹陷沙三段下亚段泥岩裂缝储层岩性分类及测井识别[J].油气地质与采收率,2011,18(6):18-22.
[8]范昌育,王震亮.页岩气富集与高产的地质因素和过程[J].石油实验地质,2010,32(5):465-469.
[9]袁静.沾化凹陷罗家地区沙四段顶部至沙三段泥质岩裂缝特征及其影响因素[J].石油大学学报:自然科学版,2003,27(4):20-23.
[10]王延光,杜启振.泥岩裂缝性储层地震勘探方法初探[J].地球物理学进展,2006,21(2):494-501.
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