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济阳坳陷桩西古潜山储层裂缝的分形特征
周廷全¹,　陈俊侠²
(1.中国地质大学　能源学院,北京　100083;2.河南理工大学　资源环境学院,河南焦作 454003)

摘要:

依据分形理论,以岩心裂缝密度和裂缝容量维关系研究为桥梁,利用断裂的分形特征, 对济阳坳陷桩西古潜山碳酸盐储层裂缝进行定量分析,并结合研究区钻井的油气显示情况,确定桩西潜山的裂缝分维值门槛,据此对桩西古潜山储层的裂缝有利区域和含油气范围进行预测。结果表明:桩西潜山Tg₁地震反射层断裂构造分维值为1.3174,相关系数R²超过0.99,下古生界16块岩心上裂缝的容量维线性回归相关系数大于0.97,可用分数维D值来比较与评价桩西古潜山裂缝性储层中裂缝的发育程度和裂缝系统的复杂程度,定量计算该区下古生界裂缝性储层中裂缝的密度;裂缝分维值大于1.4的区域为桩西潜山裂缝发育有利区,具有较好的储层物性,是油气聚集有利区,裂缝分维值大于0.8且小于1.4的区域为裂缝发育较有利区,裂缝分维值小于0.8的区域为裂缝发育不利区。

关键词: 分形理论储层裂缝济阳坳陷桩西古潜山

DOI：10.3969/j.issn.1673-5005.2011.05.001

分类号::TE 132; P 618.130

文献标识码:A

基金项目:国家油气专项“十一五”课题(2008ZX05004-003)

Fractal characteristics of fracture in Zhuangxi buried hill reservoir, Jiyang depression

ZHOU Ting quan¹, CHEN Jun xia²

(1.School of Resources, China University of Geosciences, Beijing 100083, China;2. Resources Environment Institute, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract:

Based on fractal theory and the relationship between fracture density of core and fault capacity dimension in Zhuangxi buried hill, the fractures in carbonate reservoir were quantitatively analyzed. Combined with the exploitation situation of oil and gas in study area, the limit of fractal dimension in Zhuangxi buried hill was determined. The favorable regions of the fracture and the oil and gas accumulation were predicted in Zhuangxi buried hill reservoir, Jiyang depression. The results show that the fractal dimension of Tg₁ seismic reflection layer is 1.3174 and correlation coefficient reached 0.99. Capacity dimensional linear regression correlation coefficient of the fracture on sixteen cores of Lower Paleozoic is greater than 0.97. Fractal dimension can be used to compare and to evaluate the development degree and the complexity of fracture in Lower Paleozoic fractured reservoirs. The density of fractures was calculated quantitatively in the area under the Paleozoic fractured reservoirs. The region where the fractal dimension is greater than 1.4 is the most favorable area of fracture and favorable area for oil and gas accumulation. The region where the fractal dimension is 0.8-1.4 is more favorable area of fracture. The region where the fractal dimension is less than 0.8 is the negative area of fracture.

Key words: fractal theory reservoir fracture Jiyang depression Zhuangxi buried hill