基于层次分析法的致密气藏储层分类定量评价——以新场气田蓬莱镇组气藏为例

doi:10.13809/j.cnki.cn32-1825/te.2024.03.016

摘要/Abstract

摘要：

储层评价是致密砂岩气藏开发的基础，评价结果的准确性直接影响气藏开发的潜力分析，评价方法的选择影响到开发指标预测的可靠性、开发调整部署的科学性。为解决致密砂岩气藏储层评价影响因素多、主控因素不明确、参数敏感性未知、评价指标未量化等问题，以川西新场气田蓬莱镇组气藏为例，运用层次分析法理论，建立定量分析模型，将复杂问题简单化、定性问题定量化。方法优选地球物理、测井解释和地质基础等参数为准则指标，通过构造判断矩阵、确定指标权重、一致性检验等步骤，建立定量评价模型，得到权值向量，再利用真实井进行验证分析可采储量和无阻流量均与评价值呈现较好的相关性，说明研究方法具有较好的可靠性，进一步明确了储层划分类型及标准。根据研究方法确定的气藏储层评价指标，可以深化同区致密砂岩气藏开发“甜点”认识，提升致密砂岩气藏储层预测及开发部署质量，为同类气藏高效开发提供借鉴。

关键词: 储层评价, 致密砂岩, 判断矩阵, 参数优选, 层次分析法

Abstract:

Reservoir evaluation serves as a foundational aspect in the development of tight sandstone gas reservoirs, with the accuracy of these evaluations critically influencing potential development analyses. The selection of evaluation methodologies is pivotal in ensuring the reliability of development index predictions and the scientific integrity of adjustments and deployment strategies. Addressing the challenges inherent in evaluating tight sandstone gas reservoirs—such as numerous influencing factors, ambiguous controlling factors, unknown parameter sensitivity, and unquantified evaluation indices—this study develops a quantitative analysis model using the analytic hierarchy process（AHP）. This approach simplifies complex issues and quantifies qualitative aspects, facilitating a more structured evaluation. Utilizing geophysical data, logging interpretation, and geological fundamentals as criterion indices, the study constructs a judgment matrix to establish a quantitative evaluation model. This involves determining index weights, conducting consistency tests, and deriving a weight vector. The model is then validated through correlation analysis between the recoverable reserves, open flow, and evaluation values of actual wells. Findings demonstrate the method's reliability and further refine the criteria for reservoir classification. The evaluation indices defined through this research enhance the understanding of “sweet spots” for tight sandstone gas reservoir development within the same region, improve the precision of reservoir prediction, and aid in the strategic deployment of development activities. Ultimately, this study offers valuable insights and a methodological framework for the efficient development of similar gas reservoirs.

Key words: reservoir evaluation, tight sandstone, judgment matrix, parametric optimization, analytic hierarchy process

中图分类号:

TE122

周锋,黄仕林,李晓明,廖开贵,李勇. 基于层次分析法的致密气藏储层分类定量评价——以新场气田蓬莱镇组气藏为例[J]. 油气藏评价与开发, 2024, 14(3): 468-474.

ZHOU Feng,HUANG Shilin,LI Xiaoming,LIAO Kaigui,LI Yong. Quantitative evaluation of tight gas reservoir classification based on analytic hierarchy process: A case study of Penglaizhen Formation gas reservoir in Xinchang Gas Field[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 468-474.

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指标赋值	地球物理			测井解释					地质基础
指标赋值	振幅	波阻抗/ （kg/m³·m/s）		声波/ （μs/ft）	电阻/ （Ω·m）	孔隙度/ %	渗透率/ 10^-3 μm²		构造位置	河道宽度/ m	砂体厚度/ m
[8，10] [5，8） [2，5） [0，2）	≤-25 000 （-25 000，-20 000] （-20 000，-15 000] >-15 000	≤7 500 （7 500，8 000] （8 000，8 500] >8 500		≥85 [80，85） [75，80） <75	≥24 [18，24） [12，18） <12	≥11 [10，11） [8，10） <8	≥1 [0.6，1） [0.3，0.6） <0.3		主体高部位较高部位一般部位低部位	≥600 [400，600） [300，400） <300	≥15 [10，15） [5，10） <5

井号	地球物理		测井解释参数				地质基础参数			评价值 R
井号	振幅取值	阻抗取值	声波取值	电阻取值	孔隙度取值	渗透率取值	构造位置取值	河道宽度取值	砂体厚度取值	评价值 R
X1	5	6	9	5	10	9	9	6	8	7.78
X2	8	8	8	5	9	8	9	9	8	8.35
X3	7	8	5	6	6	5	7	8	9	7.01
X4	8	8	6	9	9	9	8	6	6	7.65
X5	9	9	7	9	9	5	8	8	8	8.22
X6	6	6	7	8	7	5	6	9	4	6.66
X7	4	4	5	9	5	4	5	7	4	5.44
X8	7	7	8	8	8	8	5	8	4	6.61
X9	7	7	5	8	9	7	6	8	7	7.15
X10	5	6	7	8	8	7	7	6	8	6.98
X11	7	7	7	9	8	7	7	8	8	7.58
X12	6	6	6	7	7	7	5	6	7	6.06
X13	7	7	8	8	8	5	6	6	8	6.85
X14	7	7	8	9	9	7	8	9	8	8.25
X15	8	8	6	9	8	7	6	7	7	7.10
X16	6	6	6	6	7	6	5	5	6	5.68

井号	评价值R	评价结果	可采储量/ 10⁴ m³	无阻流量/ （10⁴ m³/d）
X13	6.85	较差储层	292 9	3.98
X14	8.25	优质储层	555 2	9.80
X15	7.10	一般储层	355 6	6.35
X16	5.28	差储层	206 6	2.10