致密砂岩孔隙结构参数与电学性质关系研究

发布时间：2018-01-09 05:17

本文关键词：致密砂岩孔隙结构参数与电学性质关系研究　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：岩石物理是认识油气藏的基础,是衔接油气藏地质及油气藏开发的重要桥梁。以岩石物理为基础的测井是发现、评价油气藏的重要手段。致密岩石岩电参数的实验研究,是岩石物理学的重要内容,也是测井学科的基础。岩石的电性主要取决于岩石的孔隙结构特征。因此,开展岩石电学参数与孔隙结构参数关系研究,对复杂储层测井精细解释与评价具有重要意义。在苏里格气田致密砂岩气藏地质综合研究成果的基础上,探索致密砂岩电学参数测试方法及测试规程,模拟原地条件测试岩石电学参数,基于电学实验对孔隙结构与电学参数关系进行了修正,绘制了基于岩电实验数据的Pickett图版。完善了岩电实验岩样预处理洗盐方法,明确了洗盐对致密砂岩电学参数影响机理。采用抽真空多轮次甲醇高压饱和法处理致密砂岩样品,克服了因孔喉细小存在吸附气,常规索氏抽提方法很难将可溶盐洗出的不足。综合考虑致密砂岩气藏特征,建立了致密砂岩岩心电学性质测量方法及其操作规程。针对常规驱替法建立含水饱和度测量原地岩电参数存在的问题,分别采用自吸增水法和气驱降水法建立含水饱和度,测定了致密砂岩样品的电学参数。基于对2种方法实验结果分析,推荐渗透率大于1×10-3μm2的岩样使用气驱降水法；渗透率小于1×10-3μm使用自吸增水法。基于原地有效应力条件下的岩电实验,提出5%是致密砂岩岩电性质临界孔隙度。胶结指数m、饱和度指数n、地层因素F在孔隙度5%左右存在变化分界点。致密砂岩岩电实验应考虑原地有效应力,采用地面条件下的岩电参数会造成含水饱和度计算误差,误差范围在±16%。基于岩石电学实验,明确了工区致密砂岩孔喉半径、迂曲度与地层因素之间关系,并通过压汞法获取的实验数据进行了验证。同时,对孔隙结构参数对电学参数影响机理进行了研究,孔喉尺寸对电学参数影响较小,孔喉迂曲度对电学参数影响较大。饱和岩石电学参数受孔隙结构影响比不完全饱和岩石明显。依据渗透率级别划分的三类储层,Ⅰ类与Ⅲ类储层的地层因素、胶结指数、饱和度指数与孔隙度关系良好,Ⅲ类储层关系不显著。绘制了基于岩电实验数据的Pickett图版,探讨了孔隙结构参数与电学性质关系应用。
[Abstract]:Rock physics is the basis to understand the oil and gas reservoirs, is an important bridge between the oil and gas reservoir geology and exploitation of the oil and gas reservoirs. Logging based on rock physics based is found, an important means of evaluating oil and gas reservoirs. Experimental research on rock electrical parameters of tight rock, is an important content of rock physics, is also the basis of well logging the pore structure characteristics of rock. The rock electrical depends. Therefore, to carry out the research on the relationship between rock electrical parameters and pore structure parameters, is of great significance to the complex reservoir logging interpretation and evaluation.
Based on comprehensive reservoir geology research results of tight sandstone gas reservoir of Sulige gas exploration on the test methods and test procedures for electrical parameters of tight sandstone, simulation test of electrical parameters of rock in situ conditions, electrical experiments on the structure and electrical parameters are modified based on the relationship of pore, drawing the Pickett chart based on the experimental data of rock electricity.
To improve the pretreatment method of electric desalting of rock core samples, the mechanism of effects of salt on tight sandstone electrical parameters. The use of vacuum pressure method in the treatment of multiple rounds of methanol saturated sandstone samples, avoid small pore throat of adsorbed gas, the conventional method is difficult to extract the cable's lack of soluble salt elution.
The characteristics of tight sandstone gas reservoir considering the electrical properties of dense sandstone core measurement method and its operation rules are established. According to the conventional displacement method to establish electrical parameters measurement in situ water saturation problems, respectively, based on the self absorption and increase water saturation of water flooding precipitation method, the electrical parameters of tight sandstone samples was measured based on. 2 methods for the analysis of experimental results, the recommended permeability less than 1 * 10-3 M2 samples using gas flooding precipitation method; permeability less than 1 * 10-3 m using a self suction water increment method.
There should be effective electricity experiment under the condition of force, put forward 5% tight sandstone rock electrical properties of critical porosity. The cementation exponent m and saturation index n, F in about 5% porosity formation factors are changing the boundary point. Tight sandstone rock electric experiment should be considered in the effective stress, the electrical parameters of rocks under the noodles will cause the error calculation of water saturation, the range of error in 16%..
Rock electrical experiment based on the area of dense sandstone pore throat radius, the relationship between the tortuosity and the formation factors, and the experimental data obtained by mercury intrusion method was verified. At the same time, the mechanism of the effect of pore structure parameters on the electrical parameters of pore throat size has little effect on the electrical parameters, the tortuosity of pore throat the electrical parameters influence. Saturated rock electrical parameters affected by pore structure is not completely obvious. On the basis of saturated rock permeability grade three reservoir, formation factor, class I and class III reservoir cementation index, saturation index and porosity type reservoir of good relationship, the relationship is not significant. The Pickett curve drawing experiment based on the data of rock electricity, discusses the relationship between pore structure parameters and electrical properties.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.3

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