地质动探
天然气勘探与开发
多尺度裂缝地震综合预测方法以川中地区下寒武统龙王庙组气藏为例
代瑞雪冉崎关旭梁瀚喻颐吴煜宇
中国石油西南油气田公司勘探开发研究院
2017年6月出版
要四川盆地磨溪区块下寒武统龙王庙组有效储层的分布主要受聚缝及孔测发育程度控制，由于裂缝具有多尺度性和非摘
均质性，传统单一的裂缝预测方法难以对其遗行精细刻西，为此，针对该区龙王庙组储层聚缝发育特征，利用叠后地震属性预测大尺度裂缝规模，利用应力场分析及叠前方位各向异性联合精细预测中小尺度裂缝密度和方向，综合研究了该地区裂缝展布规律，最终优选出4个裂续发育条带，并对预测方法进行了对比评价。结果表明：①龙王庙组储层的大尺度裂续主要沿着断裂级构造转折端的高应变区展布，中小尺度裂缝主要集中在工区的东北和西南方向；①缝类型以构造续为主，走向为北西一南东向，与主应力方向基本一致。研究区成像测并和钻并取心资料验证了地震预测结果是准确可意的，证实了以叠前方位各向异性聚缝预测为主、叠后地震属性及应力场分析为辅的缝预测方法为分析磨溪区块龙王庙组储层渗流情况、寻找高效储渗区提供了有效的技术支撑。
关键词调
四川地
磨溪区块早寒武世
龙王庙组裂预测
DOI: 10.12055/gaskk.issn.1673-3177.2017.02.007
构造应力场
织波方位各向异性
非连续性检测
Acomprehensiveseismic method formulti-scalefractureprediction:Acase study
onLowerCambrianLongwangmiaoFormationgasreservoir,
Central SichuanBasin
DaiRuixue,Ran Qi,GuanXu,LiangHan,YuYi,WuYuyu
(ExplorationandDevelopmentResearch Institute,PetroChinaSouthwestOil&GasCompany,Chengdu,Sichuan 610015, China)
Abstract: In the Moxi block of the Sichuan Basin, the distribution of Lower Cambrian Longwangmiao Formation effective reservoirs is mainly controlled by the development degree of fractures and vugs. The fractures are characterized by multi-scale and heterogeneity so it is difficult to describe them precisely by using single traditional fracture prediction method. Considering the development char-acteristics of fractures in Longwangmiao Formation reservoirs, therefore, the size of large-scale fractures was predicted by using post stack seismic attributes and the density and direction of middle- and small-scale fractures were precisely predicted by means of stress field analysis and prestack azimuthal anisotropy jointly. Then, fracture distribution laws of this area were studied comprehensively Finally, four fracture development belts were ultimately selected and prediction methods were comparatively evaluated. It is indicated that large-scale fractures in Longwangmiao Formation reservoirs are mainly distributed at the high strain region along the breaking end of faulting structure, and middle- and small-scale fractures are mainly concentrated in the northeast and southwest of the study area. In this area, structural fractures are dominant, and fracture orientation is NW-SE, basically consistent with principal stress direction. The reliability and accuracy of seismic prediction results are verified by the imaging logging and coring data of the study area. It is proved that this fracture prediction method with prestack azimuthal anisotropy as the principal technology and poststack seismic attribute and eoeaaseooeaaaaeeaaeoesesee eaeaase
Keywords: Sichuan Basin; Moxi block; Early Cambrian; Longwangmiao Formation; Fracture prediction; P-wave azimuthal anisotro-py; Non-continuous detection; Tectonic stress field
基金项目：中国石油天然气股份有限公司重大科技专项课题“四川盆地碳酸岩盐岩地球物理关键技术研究与应用”（编号：2016E-0604)、国家科技重大专项课题“大型深层裂缝孔润型碳酸盐岩气藏地球物理评价及预测技术研究及应用”（编号： 2016ZX05052001)。
第一作者：代瑞雪，女，1989年生，工程师，硕士：主要从事地震精细解释及储层预测综合研究工作。地址：（610041）四川省
成都市高新区天府大道北段12号石油科技大厦，E-mail:dairuixue@petrochina.com.cn·38·
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