大斜度井及水平井垂向纵波时差在页岩孔隙度评价中的应用

doi:10.7657/XJPG20210513

摘要/Abstract

摘要：

四川盆地长宁页岩气开发示范区采用直井作为评价控制点,用密度、补偿中子、纵波时差、自然伽马能谱、电阻率与岩心分析孔隙度和饱和度建立的参数模型进行资源评价;开发采用水平井,利用与直井相同的测井资料与直井岩心分析孔隙度和饱和度建立的参数模型评价各类储集层,纵波时差是孔隙度和岩石力学参数模型的基础资料。结果表明,研究区直井中测量得到的纵波时差大于大斜度井和水平井,纵波时差受井斜角影响较大,且随井斜角增大而影响增大,在垂向和水平方向上具有明显的速度各向异性。尤其在同层位、同井段,大斜度井及水平井采用孔隙度模型计算得到的孔隙度与岩心分析孔隙度差异大。分析研究区直井、大斜度井及水平井同层位纵波时差与井斜角的关系,对直接拟合法和各向异性椭圆模型法计算得到的垂向纵波时差和孔隙度进行对比分析,2种方法均能排除各向异性的影响,各向异性椭圆模型法的效果更好,在研究区页岩储集层孔隙度评价中广泛应用,取得良好的效果。

关键词: 四川盆地, 长宁页岩气开发示范区, 页岩气, 大斜度井, 水平井, 各向异性, 垂向纵波时差, 孔隙度

Abstract:

In Changning Shale Gas Pilot Development Area of Sichuan basin and based on vertical wells, a parameter model is built by using density, neutron, P-wave slowness, GR and resistivity logging data and core porosity and saturation to evaluate the resources. Horizontal well is used to develop the shale gas in the area. A parameter model is established with the same logging data from horizontal wells and core porosity and saturation from vertical wells to evaluate reservoirs in horizontal wells. P-wave slowness is the basic data for building the porosity and rock mechanical parameter model. The results show that the P-wave slowness measured in vertical wells is greater than those measured in highly deviated wells and horizontal wells in the Changning shale gas area. The P-wave slowness is greatly affected by well deviation, and the larger the well deviation, the greater the influence because of obvious velocity anisotropy in vertical and horizontal directions. In the same horizon and the same well interval, the porosity calculated from the model in highly deviated or horizontal wells is significantly different from the core porosity. In this study, we analyzed the relationships between P-wave slowness and well deviation in the same interval of the vertical, highly deviated and horizontal wells in the study area, and compared the P-wave slowness and porosities calculated by direct fitting method and anisotropic elliptic model method. It is considered that both of the two methods can reduce the influences of anisotropy and the anisotropic elliptic model method works better. Finally, the anisotropic elliptic model method has been widely used in porosity evaluation of shale reservoirs and good results have been gained in the study area.

Key words: Sichuan basin, Changning Shale Gas Pilot Development Area, shale gas, highly deviated well, horizontal well, anisotropy, vertical P-wave slowness, porosity

中图分类号:

TE112.24

郑健, 傅永强, 陈满, 井翠, 张婧, 周昊, 张家浩. 大斜度井及水平井垂向纵波时差在页岩孔隙度评价中的应用[J]. 新疆石油地质, 2021, 42(5): 598-604.

ZHENG Jian, FU Yongqiang, CHEN Man, JING Cui, ZHANG Jing, ZHOU Hao, ZHANG Jiahao. Application of Vertical P-Wave Slownesses in Porosity Evaluation of Shale Gas Reservoirs in Highly Deviated or Horizontal Wells[J]. Xinjiang Petroleum Geology, 2021, 42(5): 598-604.

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