双鱼石构造深层气藏三压力剖面的建立及应用

发布时间：2018-06-25 06:20

本文选题：双鱼石构造 + 深层气藏　；参考：《西南石油大学》2017年硕士论文

【摘要】：双鱼石构造深层气藏雷口坡-栖霞组地层以碳酸盐岩为主,地层微裂缝发育、各向异性强,纵向上存在多套压力系统,属于典型的超深、高温和高压、高含硫气藏。钻井过程中井眼坍塌和井漏等井下复杂事故频发,导致机械钻速慢、钻井周期长,严重影响了该区深层气藏勘探开发进程。因此,很有必要搞清地层三压力(地层孔隙压力、坍塌压力和破裂压力)剖面特征。本文充分利用现有的地质资料、测井资料及钻井资料等,以岩石力学和井壁稳定力学为理论依据,开展了以下研究工作:①复杂地层岩性测井分析;②岩石力学参数的测井计算;③地应力和地层三压力剖面的计算;④安全钻井液密度窗口的确定及井壁稳定性评价;⑤编程处理多口井测井资料。取得的主要研究成果如下:(1)基于NCRA法开展了复杂地层岩性分析,计算了地层泥质含量、孔隙度和渗透率及含水饱和度等参数,建立了岩性体积分析剖面,为岩石力学参数的计算提供依据。(2)利用关键井的纵、横波时差关系构建了工区横波时差曲线,建立了该构造岩石力学参数的计算模型及动、静态岩石力学参数转换关系,获得了工区岩石力学参数剖面的纵向变化特征。(3)针对工区地层岩性及孔隙压力变化较大特征,研究发现地层声波时差、电阻率、密度对地层有效应力反映较为敏感,本文分别采用基于有效应力法的多元非线性模型与ANNBP法预测地层孔隙压力,计算结果表明,ANNBP法精度较高;同时根据该构造的地质力学特征,优选了地应力的计算模型。(4)通过井壁稳定性的力学分析,基于岩石破坏准则分别建立了地层坍塌压力和破裂压力的计算模型;同时依据所建立的地层三压力剖面的变化特征确定了该构造深层气藏的安全钻井液密度窗口。(5)基于Forward.NET解释平台,编制了计算地层三压力及确定安全钻井液密度窗口的程序"SWPU-9P-SYS",处理了多口井的测井资料,建立了 3 口井的岩石力学参数、地应力及地层三压力剖面,给出了安全钻井液密度窗口,并进行了井壁稳定性评价。通过上述研究,形成了一套利用测井曲线建立双鱼石构造深层气藏三压力剖面的方法与技术,可用于确定安全钻井液密度窗口与评价井壁稳定性,结果合理可靠,为该构造深层气藏的安全优质高效钻进提供了决策依据。
[Abstract]:In the deep gas reservoir of Pisces structure, the strata of Leikoupo to Qixia formation are mainly carbonate rocks, the formation microfractures are developed, the anisotropy is strong, and there are many sets of pressure systems in longitudinally, which belong to typical ultra-deep, high-temperature and high-pressure gas reservoirs with high sulfur content. Borehole collapse and well leakage occur frequently during drilling, which results in slow drilling speed and long drilling cycle, which seriously affects the exploration and development process of deep gas reservoirs in this area. Therefore, it is necessary to understand the profile characteristics of three formation pressures (pore pressure, collapse pressure and fracture pressure). This paper makes full use of the existing geological data, logging data and drilling data, taking rock mechanics and wellbore stability mechanics as the theoretical basis, and carries out the following research work: 1. (2) well logging calculation of rock mechanics parameters; calculation of in-situ stress and formation three pressure profile; determination of safe drilling fluid density window and evaluation of wellbore stability; programming processing of multiple well logging data. The main research results are as follows: (1) based on the NCRA method, the lithology analysis of complex strata is carried out, and the parameters of shale content, porosity, permeability and water saturation are calculated, and the lithology volume analysis profile is established. It provides the basis for the calculation of rock mechanics parameters. (2) by using the longitudinal and shear wave moveout relations of key wells, the shear wave moveout curve in the working area is constructed, and the calculating model of the structural rock mechanics parameters and the dynamic and static rock mechanical parameters conversion relations are established. The longitudinal variation characteristics of rock mechanics parameter profile are obtained. (3) in view of the larger variation of lithology and pore pressure, it is found that the formation acoustic time difference, resistivity and density are sensitive to the effective stress in the formation. In this paper, the multivariate nonlinear model based on effective stress method and the ANNBP method are used to predict the formation pore pressure respectively. The calculation results show that the ANNBP method has a high accuracy, and according to the geological and mechanical characteristics of the structure, (4) through mechanical analysis of wellbore stability, the calculation models of formation collapse pressure and fracture pressure are established based on rock failure criterion. At the same time, the safe drilling fluid density window of the deep gas reservoir is determined according to the variation characteristics of the formation three pressure profile. (5) based on the Forward.NET interpretation platform, The program "SWPU-9P-SYS" for calculating formation three pressure and determining safe drilling fluid density window is developed. The logging data of many wells are processed, and the rock mechanics parameters, ground stress and formation three pressure profiles of 3 wells are established. The safe drilling fluid density window is given and the stability evaluation is carried out. Through the above research, a set of methods and techniques for establishing three pressure profiles of deep gas reservoirs of Pisces structure by using logging curves have been developed, which can be used to determine the density window of safe drilling fluid and to evaluate the stability of wellbore, and the results are reasonable and reliable. It provides a decision basis for safe, high quality and high efficiency drilling of the deep gas reservoir.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE21

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