﻿ 常规气测录井综合气体指数解释法的建立及其在油气储层解释中的应用 The Establishment of Comprehensive Gas Index Interpretation Process for Conventional Gas Logging and Its Application in Oil and Gas Reservoir Interpretation

Journal of Oil and Gas Technology
Vol.39 No.04(2017), Article ID:22003,11 pages
10.12677/JOGT.2017.394033

The Establishment of Comprehensive Gas Index Interpretation Process for Conventional Gas Logging and Its Application in Oil and Gas Reservoir Interpretation

Mingfa Yu, Haifeng Guo, Wei Zhuang, Yongjie Xue, Guiqin Han

Interpretation Research Center of CNPC Great Wall Drilling Engineering Company, Beijing

Received: Mar. 10th, 2017; accepted: Jul. 15th, 2017; published: Aug. 15th, 2017

ABSTRACT

The conventional gas logging was an important method to find oil and gas show and to evaluate the oil-bearing property of the reservoir. The gas logging data of different types of oil and gas reservoirs had different characteristics, so the summarized characteristics of oil and gas reservoir could be used for classifying the types of reservoirs. The Comprehensive Gas Index (COGASIN) method was a series of evaluation indices calculated from the C1 - C5 components in conventional gas logging data, which was a new method for distinguishing the reservoir types by plotting index curve and 3-element graph. This method can identify fluid property clearly in the primary reservoir, and combined with the quantitative parameters of gas logging total hydrocarbon data, reservoir interpretation can be carried out. This paper introduces the computing method of comprehensive gas index, and the characteristics of integrated gas index 3-element graph and curve from the gas logging data of different types of oil and gas reservoirs are analyzed. A technical method based on the ratio index of light hydrocarbon is preliminarily created to reflect reservoir characteristics.

Keywords:Logging, Gas Logging Ratio Method, Hydrocarbon Reservoir, Reservoir Property, Reservoir Fluid Property Interpretation

1. 概述

2. 方法设计

2.1. 综合气体指数计算

2.2. 综合气体指数解释评价图

C1~C5的7种组分在检测条件下均为气态烃。基于5个综合气体指数，根据油气显示的实际情况，进行合理的组合，对轻烃组分分组：以C1表征轻质气态烃；以C2 + C3表征中质气态烃；以C4 + C5表征重质气态烃。采用I1、I2 + I3、I4 + I5的组合方式，可以随深度绘制综合气体指数录井解释评价图(如图1所示)，在纵向上反映轻烃组分相对比例的变化情况，便于对不同层位储层流体性质进行比较，横向上进行邻井对比，可反映油藏特征的变化。

2.3. 综合气体指数三元图

Figure 1. The logging interpretation and evaluating diagram for comprehensive gas index of different reservoir fluids

Figure 2. The 3-element graph of comprehensive gas index

3. 在不同流体性质油气层的综合气体指数特征

3.1. 气层

3.1.1. 干气层

3.1.2. 湿气层

3.2. 凝析气层以及油层

3.2.1. 凝析气层

3.2.2. 轻质油层

3.2.3. 中质油层

3.2.4. 重质油层及稠油层

HF14N14井的Jeribe和Upper Kirkuk 1地层井段为1920~1970 m，荧光录井顶部见弱显示，TG从0.1158%上升至6.9734%，组分峰值C1为1.5594%，C2为0.7943%，C3为0.5602%，iC4为0.1307%，nC4为0.2739%，iC5为0.1000%，nC5为0.1085%；依据TG以及I1的特征值范围为35%~55%，该井段储层气测解释为油层，油质较重。1926~1931 m酸化后采用气举工艺试油，获取原油的密度0.916~0.922 g/cm3，该井未收集到产量数据。邻井HF1井该层位有143.08 m3/d的产能，原油的密度0.9206 g/cm3，HF3S1H井酸化后有188.23 m3/d的原油产量，报告中无原油的密度数据。该层位储层的流体性质属于重质油层，其综合气体指数特征见图1图2。HF61Y61井Jeribe和Upper Kirkuk 1地层所处的构造位置较低，接近油水界面位置，其I1偏低，在三元图上所处的位置位于I1 = 10%~30%的区间，作为一种特殊显示的代表，其综合气体指数特征见图1图2

4. 气体综合指数法的应用

4.1. 单井解释中的应用

Figure 3. The 3-element graph of comprehensive gas index in the displayed layer of Well HF2N4

Figure 4. The cross plot of TG-I1 in Well HF2N4

4.2. 油藏研究中的应用

5. 结语

Figure 5. The curves of Khasib and Mishrif Strata in Well HF2N4

Figure 6. The 3-element graph of comprehensive gas index in Jeribe + Kirkuk and Hartha Reservoirs of HF Oilfield

The Establishment of Comprehensive Gas Index Interpretation Process for Conventional Gas Logging and Its Application in Oil and Gas Reservoir Interpretation[J]. 石油天然气学报, 2017, 39(04): 18-28. http://dx.doi.org/10.12677/JOGT.2017.394033

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