5700声波测井资料在某区块砂岩中的应用研究

发布时间：2018-03-29 23:15

本文选题：阵列声波　切入点：弹性模量　出处：《长江大学》2015年硕士论文

【摘要】：5700阵列声波测井有四种测量方式,分别为纵波测量、单级发射测量、偶极发射测量、交叉发射测量。一次测井可提供岩石的纵波、横波时差,低速度层快横波、慢横波时差。对岩石力学性质研究提供了较为完整的资料。论文对某区块砂岩地质特征,储层特征及测井响应特征进行了详细分析,认为该区块砂岩属于低孔隙度、低渗透率储层,为了获得更高油气产量,对这类储层需要进行压裂改造。根据5700阵列声波资料,结合岩石物理模型,对岩石弹性进行了分析研究。利用测井数据分别计算了不同井、不同层位的泊松比、杨氏模量、体积模量及岩石强度参数。泊松比呈低值,杨氏模量高值,说明岩石弹性特性好,便于压裂改造,利用快横波、慢横波时差估算了地层各向异性。当快横波时差和慢横波时差接近时,反映岩石是各向同性介质；当快慢横波时差有差异,岩石是各向异性介质,引起这种差异原因是裂缝的存在,造成横波分裂。根据纵横波时差比值识别气层,纵波时差与岩石含气量有关,随含气饱和度增加,纵波时差增加,纵波时差与气有关；横波时差随含气量增加基本不变。纵横波时差比降低。通过几口井的计算和分析,结果表明,利用5700阵列声波资料计算得到岩石的弹性模量及其它参数,能够很好反映岩石的物理性质。同等地质条件下,破裂压力却大,越不易压开,相反,越易压开。对地层破裂压力的预测、对于油气井的安全快速钻进、完井、以及油气井的压裂增产措施都有很重要的意义。
[Abstract]:5700 array acoustic logging has four measuring methods: longitudinal wave measurement, single stage emission measurement, dipole emission measurement and cross emission measurement.A single log can provide rock longitudinal wave, shear wave time difference, low velocity layer fast shear wave, slow shear wave time difference.More complete data are provided for the study of rock mechanical properties.In this paper, the geological characteristics, reservoir characteristics and logging response characteristics of sandstone in a certain block are analyzed in detail. It is considered that the sandstone in this block belongs to low porosity and low permeability reservoir, in order to obtain higher oil and gas production,Fracturing is necessary for this kind of reservoir.Based on 5700 array acoustic data and rock physical model, rock elasticity is analyzed and studied.The Poisson's ratio, Young's modulus, volume modulus and rock strength parameters of different wells and different layers were calculated by using logging data.Poisson's ratio is low and Young's modulus is high, which shows that rock has good elastic properties and is convenient for fracturing. The formation anisotropy is estimated by using fast shear wave and slow shear wave time difference.When the fast shear wave time difference and the slow shear wave time difference approach, the rock is an isotropic medium, and when the fast and slow shear wave time difference is different, the rock is an anisotropic medium, which is caused by the existence of cracks and the shear wave splitting.According to the ratio of P-S wave moveout, the P-wave moveout is related to the gas content of rock, with the increase of gas saturation, the P-wave moveout increases, the P-wave moveout is related to gas, and the S-wave moveout is basically unchanged with the increase of gas content.The time difference ratio of P-S wave is reduced.Through the calculation and analysis of several wells, the results show that the elastic modulus and other parameters of rock can be calculated by using 5700 array acoustic data, which can well reflect the physical properties of rock.Under the same geological conditions, the fracture pressure is greater, the harder to open, the easier to open.The prediction of formation fracture pressure is of great significance for safe and rapid drilling, completion and fracturing of oil and gas wells.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.81;P618.13

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