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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
A comprehensive seismic method for multi-scale fracture prediction: a case study on Lower Cambrian Longwangmiao Formation gas reservoir,Central Sichuan Basin
代瑞雪 冉崎 关旭 梁瀚 喻颐 吴煜宇
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DOI:10.12055/gaskk.issn.1673-3177.2017.02.007
作者单位:中国石油西南油气田公司勘探开发研究院
中文关键字:四川盆地 磨溪区块 早寒武世 龙王庙组 裂缝预测 纵波方位各向异性 非连续性检测 构造应力场
英文关键字:Sichuan Basin; Moxi block; Early Cambrian; Longwangmiao Formation; Fracture prediction; P-wave azimuthal anisotropy;Non-continuous detection; Tectonic stress field
中文摘要:

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裂缝及孔洞发育程度控制,由于裂缝具有多尺度性和非均质性,传统单一的裂缝预测方法难以对其进行精细刻画。为此,针对该区龙王庙组储层裂缝发育特征,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 个裂缝发育条带,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缝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;②裂缝类型以构造缝为主,走向为北西—南东向,与主应力方向基本一致。研究区成像测井和钻井取心资料验证了地震预测结果是准确可靠的,证实了以叠前方位各向异性裂缝预测为主、叠后地震属性及应力场分析为辅的裂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。

英文摘要:

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 characteristics of fractures in Longwangmiao Formation reservoirs, therefore, the size of large-scale fractures was predicted by using poststack 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 stress field analysis as the auxiliary technology can technically provide the effective support for analyzing the seepage performance of Longwangmiao Formation reservoirs in the Moxi block and searching for high-efficiency pay zones with high permeability.

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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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