四川盆地新场气田致密砂岩裂缝预测技术研究
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摘要
四川盆地新场气田三叠系须家河组砂岩气藏是一个致密砂岩裂缝型气藏。储集层的基质孔隙度很低,平均只有3.8%,基质渗透率低于0.3 mD,以裂缝贡献渗透率为主。通过采用新一代三维空间全局寻优离散扫描技术,精确扫描地震轴的产状,分析井上裂缝密度与精细扫描后各种地震几何属性关系,指出利用像素成像属性预测大尺度裂缝、利用曲率属性预测小尺度裂缝是有效的。在裂缝分析基础上找到研究区裂缝发育特点,利用岩性和曲率属性做约束,由井出发预测地震级别的大尺度裂缝和小尺度网状缝的密度。结合构造部位和生产井生产状况,指出在有利储集层圈定前提下,构造高部位的裂缝发育区是有利的勘探开发区。
The Triassic sandstone gas reservoir in Xujiahe formation is a type of tight sandstone fractured reservoir in Xinchang gas field of Sichuan Basin.The matrix porosity is very low,and the average porosity is just 3.8%.The matrix permeability is less than 0.3 mD,while the permeability of gas reservoir is mainly provided by fractures.Adopting the new generation global optimization discrete scanning technology in three-dimensional space,the seismic event occurrence can be scanned accurately.By means of anslysing the relationship between fracture density of wells and seismic geometric attributes scanned precisely,it is concluded that pixel imaging attribute is effective to predict large scale fracture and curvature attribute is effective to small scale fracture.The fracture development characteristics based on fracture analysis,making use of lithology and curvature attribute as constraints,starting from the well data,the density of the large scale fracture with seismic level and small scale net fracture can be predicted.According to the structure position and the producting condition of production wells,the area with fractures developed in structural high part is the advantageous area for exploration and development on condition that good reservoir is sure.
The Triassic sandstone gas reservoir in Xujiahe formation is a type of tight sandstone fractured reservoir in Xinchang gas field of Sichuan Basin.The matrix porosity is very low,and the average porosity is just 3.8%.The matrix permeability is less than 0.3 mD,while the permeability of gas reservoir is mainly provided by fractures.Adopting the new generation global optimization discrete scanning technology in three-dimensional space,the seismic event occurrence can be scanned accurately.By means of anslysing the relationship between fracture density of wells and seismic geometric attributes scanned precisely,it is concluded that pixel imaging attribute is effective to predict large scale fracture and curvature attribute is effective to small scale fracture.The fracture development characteristics based on fracture analysis,making use of lithology and curvature attribute as constraints,starting from the well data,the density of the large scale fracture with seismic level and small scale net fracture can be predicted.According to the structure position and the producting condition of production wells,the area with fractures developed in structural high part is the advantageous area for exploration and development on condition that good reservoir is sure.
引文
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3彭红利,熊钰,孙良田,等.主曲率法在碳酸盐岩气藏储层构造裂缝预测中的应用研究.天然气地球科学,2005;16(3):343—346
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10陈广坡,王天琦,刘应如,等.中国南海某盆地A凹陷灰岩潜山有效裂缝预测.石油勘探与开发,2008;35(3):313—317
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12李志勇,曾佐勋,罗文强.裂缝预测主曲率法的新探索.石油勘探与开发,2003;30(6):83—85
13 Kurt J,Lynn Kirlin M R,Farmer S L,et al.3-D seismic attributesusing a semblance-based coherency algorithm.Geophysics,1998;63(4):1150—1165
14 Bakker P.Image structure analysis for seismic interpretation.ISBN:90—75691—08—4.2002
15王伟.哥伦比亚Ombu区Kc组裂缝描述和地质建模.现代地质,2012;26(1):139—144
16陈烨菲,蔡冬梅,范子菲,等.哈萨克斯坦盐下油藏双重介质三维地质建模.石油勘探与开发,2008;35(4):492—497
2赵文,张广清,唐梅荣,等.井网条件下不规则水力裂缝与产量关系.科学技术与工程,2011;11(33):8165—8177
3彭红利,熊钰,孙良田,等.主曲率法在碳酸盐岩气藏储层构造裂缝预测中的应用研究.天然气地球科学,2005;16(3):343—346
4刘振峰,曲寿利,孙建国,等.地震裂缝预测技术研究进展.石油物探,2012;51(2):191—198
5刘宏,蔡正旗,谭秀成.川东高陡构造薄层碳酸盐岩裂缝型储集层预测.石油勘探与开发,2008;35(4):431—436
6苏培东,秦启荣,黄润秋.储层裂缝预测研究现状与展望.西南石油学院学报,2005;27(5):14—16
7周新桂,张林炎,黄臣军,等.鄂尔多斯盆地沿河湾探区低渗储层长61构造裂缝主要形成期应力环境判识.现代地质,2009;23(5):843—851
8马如辉.致密砂岩储层的裂缝预测.天然气工业,2005;25(10):36—37
9唐建明.川西坳陷致密非均质气藏储层空间展布刻划.天然气工业,2002;22(4):19—23
10陈广坡,王天琦,刘应如,等.中国南海某盆地A凹陷灰岩潜山有效裂缝预测.石油勘探与开发,2008;35(3):313—317
11周新桂,操成杰,袁嘉音,等.油气盆地储层构造裂缝定量预测研究方法及其应用.吉林大学学报(地球科学版),2004;34(1):80—84
12李志勇,曾佐勋,罗文强.裂缝预测主曲率法的新探索.石油勘探与开发,2003;30(6):83—85
13 Kurt J,Lynn Kirlin M R,Farmer S L,et al.3-D seismic attributesusing a semblance-based coherency algorithm.Geophysics,1998;63(4):1150—1165
14 Bakker P.Image structure analysis for seismic interpretation.ISBN:90—75691—08—4.2002
15王伟.哥伦比亚Ombu区Kc组裂缝描述和地质建模.现代地质,2012;26(1):139—144
16陈烨菲,蔡冬梅,范子菲,等.哈萨克斯坦盐下油藏双重介质三维地质建模.石油勘探与开发,2008;35(4):492—497
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