LZ地区致密砂岩储层裂缝综合预测方法及应用
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摘要
LZ地区储层为低孔、低渗致密砂岩储层,裂缝控制了储层的储渗空间和井的产能。通过对LZ地区的构造特征及演化分析,并结合野外露头资料对裂缝产状进行分期配套,认为该区主要发育横张缝、剪切缝以及断层伴生缝和派生缝等构造成因裂缝。针对以上3种构造裂缝类型,分别采用构造曲率法、古构造应力场有限元模拟法、地震不连续性检测法等对该区不同类型裂缝的分布进行了预测,并采用权重评价方法综合这3种预测成果进行裂缝的综合预测,即建立各预测方法的准确率与其影响因子之间的回归函数,再根据预测方法的准确率确定权重系数,将不同方法的预测成果进行综合权重计算,从而对研究区致密储层的裂缝发育情况进行综合预测,经钻井资料证实其预测效果较好。
The reservoir in LZ area is tight sandstone reservoir,and fractures control the reservoir spaces and well capacity.Based on the analysis of structural features and evolution,combined with the fracture divided period coordination on the basis of outcrop data,the tectonic origin of fractures is analyzed.It is considered that the fractures developed in the study area mainly are shear fracture,tensional fracture,associated and derived fractures with faults.The constructional curvature method,paleotectonic stress field finite element modeling method and seismic discontinuity detection method are applied to predict the different fractures respectively.The weight is adopted to evaluate the prediction results.It is to establish the regression function between the accuracy of the prediction method and its influencing factors,and then define the weight coefficient through the prediction accuracy and calculate the weights of the different prediction results.Finally it can be used to predict the fracture development in tight sandstone reservoir in the study area.The well drilling data prove the good prediction effects.
The reservoir in LZ area is tight sandstone reservoir,and fractures control the reservoir spaces and well capacity.Based on the analysis of structural features and evolution,combined with the fracture divided period coordination on the basis of outcrop data,the tectonic origin of fractures is analyzed.It is considered that the fractures developed in the study area mainly are shear fracture,tensional fracture,associated and derived fractures with faults.The constructional curvature method,paleotectonic stress field finite element modeling method and seismic discontinuity detection method are applied to predict the different fractures respectively.The weight is adopted to evaluate the prediction results.It is to establish the regression function between the accuracy of the prediction method and its influencing factors,and then define the weight coefficient through the prediction accuracy and calculate the weights of the different prediction results.Finally it can be used to predict the fracture development in tight sandstone reservoir in the study area.The well drilling data prove the good prediction effects.
引文
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[4]周新桂,邓宏文,操成杰.储层构造裂缝定量预测研究及评价技术[J].地球学报,2003,24(2):175-180.
[5]王国刚,苏培东,秦启荣.罗家寨构造嘉陵江组嘉四2段底部裂缝预测[J].岩性油气藏,2009,21(4):82-86.
[6]杨凯,郭肖.裂缝性低渗透油藏三维两相黑油数值模拟研究[J].岩性油气藏,2009,21(3):118-121
[7]王孟华,崔永谦,张锐峰,等.泥灰岩裂缝储层预测方法研究——以束鹿凹陷为例[J].岩性油气藏,2007,19(3):110-119.
[8]葛善良,周文,谢润成,等.复杂构造变形地区致密岩石力学性质实验分析[J].岩性油气藏,2010,22(1):59-64.
[9]Maerten L,Maerten F.Chronologic modeling of faulted and fractured reservoirs using geomechanically based restoration:Technique and industry applications[J].AAPG Bulletin,2006,90(8):1201-1226.
[10]陈波,田崇鲁.储层构造裂缝数值模拟技术的应用实例[J].石油学报,1998,19(4):50-54.
[11]李虎,秦启荣,王志萍,等.大邑构造须二段储层裂缝预测[J].岩性油气藏,2010,22(2):107-115.
[12]黄捍东,魏修成,叶连池,等.分形边缘检测在裂缝预测中的应用[J].石油地球物理勘探,2002,37(1):65-68.
[13]徐开礼,朱志澄.构造地质学[M].北京:地质出版社,1998:111-118.
[14]童亨茂.储层裂缝综合预测方法在GBEIBE油田的应用[J].中国石油勘探,2007,(3):77-80.
[15]周艳辉,高静怀.局部结构熵算法在地震数据不连续性检测中的应用[J].煤田地质与勘探,2007,35(1):71-73.
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