黄骅拗陷辉绿岩蚀变带储层预测方法  

Reservoir prediction in diabase alteration zone,Huanghua depression

作　　者：姚军[1] 刘化清[1] 曾建宏[2] 李双文[1,2] 倪长宽[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]大港油田勘探开发研究院,天津300280

出　　处：《石油地球物理勘探》2012年第3期477-482,359+518,共6页Oil Geophysical Prospecting

摘　　要：黄骅拗陷辉绿岩蚀变带储层裂缝非常发育,但蚀变带厚度较小,这为蚀变带储层预测增大了难度。为此,本文以黄骅拗陷R区的测井资料为出发点,分析了蚀变带的测井响应特征,认为蚀变带的补偿密度值、补偿中子值及自然伽马值与围岩和辉绿岩的界限较为明显;进而选择了波阻抗反演与多属性反演相结合的方法对辉绿岩蚀变带的分布范围和厚度进行了预测;利用"综合概率法"对多种测井响应进行计算,得到表征裂缝发育程度的裂缝发育指数曲线,并再次通过多属性反演,预测了蚀变带裂缝的分布范围和发育程度。通过实际钻井资料验证,预测结果准确度高,为该区辉绿岩蚀变带储层预测提供了重要的依据。In Huanghua depression reservoir fractures of diabase alteration zones are developed,but the thickness of alteration zones is thin,and consequently this makes reservoir prediction rather difficult.In order to overcome this difficulty,we take well logging data of drilling diabase alteration zone in district R of Huanghua depression as starting point,and analyze the characteristics of log response.We conclude that DEN value,CNL value and GR value are obvious in the interfaces between alteration zones and surrounding rock or diabase.Then we combine the impedance inversion and multi-attribute inversion to predict the distribution of diabase alteration zones and their thickness.According to the synthetic probability method,the well logs which are sensitive to fractures are calculated to obtain a fracture development exponential curve representing the degree of fracture development.Then utilizing multi-attribute inversion method again we predict the distribution of alteration zones and their fracture development.Actual drilling data proves reservoir predication accurateness of diabase alteration zone in the region by our approach.

关 键 词：黄骅拗陷 辉绿岩蚀变带 裂缝 测井响应 波阻抗反演 多属性反演 

分 类 号：P631[天文地球—地质矿产勘探]