鄂尔多斯盆地长8、长6天然裂缝差异性研究及其对开发的影响
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摘要
通过野外露头、岩心观察、成像测井以及压裂施工曲线等资料的对比,认为鄂尔多斯盆地长8、长6特低渗储层天然裂缝发育程度差异较大,裂缝分布规律性明显.西南物源储层天然裂缝没有东北物源和湖盆中心储层天然裂缝发育.结合微地震监测资料,研究了天然裂缝发育程度对压裂缝控制作用,在天然裂缝发育区,由于人工压裂缝可能沿天然裂缝延伸,形成较大的有效渗流面积,因此,油田开发井网部署不仅要研究最大主应力方向,而且还要研究天然裂缝的发育程度,天然裂缝发育区适当放大井排距下仍能建立有效压力驱替系统,提高单井控制储量,降低水淹风险,这对指导特低渗油田注水开发具有重要的意义.
Through the conservation of outcrops and cores and the contrastive study of imaging well-logging data and fracturing curves,it is held that there is greater difference between the development degrees of the natural fractures in Chang 8 and Chang 6.The natural fractures in the reservoirs whose hydrocarbon is from the north-east and the reservoirs in the center of the basin are more developed than those in the reservoirs whose hydrocarbon is from south-west of the basin.With the information combining with microseismic monitoring data,the controlling effect of the natural fractures on fracturing fractures is studied.In the areas where the natural fractures are developed,the fracturing fractures may elongate along the natural fractures to form a larger effective percolation area,so not only the maximum principle stress direction but also the development degree of the natural fractures are studied when oilfield well network is arranged.In the areas where the natural fractures are developed,the distance between well rows can be properly increased,which can still establish effective pressure displacement system and reduce the risk of waterflooding.The research result in this paper is very important to the water injection development of ultra-low permeability reservoirs.
Through the conservation of outcrops and cores and the contrastive study of imaging well-logging data and fracturing curves,it is held that there is greater difference between the development degrees of the natural fractures in Chang 8 and Chang 6.The natural fractures in the reservoirs whose hydrocarbon is from the north-east and the reservoirs in the center of the basin are more developed than those in the reservoirs whose hydrocarbon is from south-west of the basin.With the information combining with microseismic monitoring data,the controlling effect of the natural fractures on fracturing fractures is studied.In the areas where the natural fractures are developed,the fracturing fractures may elongate along the natural fractures to form a larger effective percolation area,so not only the maximum principle stress direction but also the development degree of the natural fractures are studied when oilfield well network is arranged.In the areas where the natural fractures are developed,the distance between well rows can be properly increased,which can still establish effective pressure displacement system and reduce the risk of waterflooding.The research result in this paper is very important to the water injection development of ultra-low permeability reservoirs.
引文
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[3]曾联波,田崇鲁,刘刚.松辽盆地南部低渗透砂岩储层裂缝特征及其对油田开发的影响[J].石油大学学报:自然科学版,1998,22(2):11-13.
[4]孙庆和,何玺,李长禄.特低渗透储层微裂缝特征及对注水开发效果的影响[J].石油学报,2000,21(4):52-57.
[5]梁兵,王焕弟.储层微裂缝预测技术[J].石油地球物理勘探,2003,38(4):400-404.
[6]张莉.陕廿宁盆地储层裂缝特征及形成的构造应力场分析[J].地质科技情报,2003,22(2):21-24.
[7]周新桂,邓宏文,操成杰,等.储层构造裂缝定量预测研究及评价方法[J].地球学报,2003,24(2):175-180.
[8]周新桂,操成杰,袁嘉音.储层构造裂缝定量预测与油气渗流规律研究现状和进展[J].地球科学进展,2003,18(3):398-402.
[9]曾联波.低渗透砂岩油气储层裂缝及其渗流特征[J].地质科学,2004,39(1):11-17.
[10]邢振辉,程林松,周新桂,等.鄂尔多斯盆地北部塔巴庙地区上古生界致密砂岩气藏天然裂缝形成机理浅析[J].地质力学学报,2005,11(1):33-42.
[11]李玉喜,肖淑梅.储层天然裂缝与压裂裂缝关系分析[J].特种油气藏,2000,7(3):26-29.
[12]赵重远,刘池阳.华北克拉通沉积盆地形成与演化及其油气赋存[M].西安:西北大学出版社,1990,35-50.
[13]袁士义,宋新民,冉启全.裂缝性油藏开发技术[M].北京:石油工业出版社,2004.
[14]李民河,廖健德,赵增义,等.微地震波裂缝检测技术在油田裂缝研究中的应用——以克拉玛依八区乌尔禾组油藏为例[J].油气地质与采收率,2004,11(3):16-18.
[15]刘百红,秦绪英,郑四连,等.微地震监测技术及其在油田中的应用现状[J].勘探地球物理进展,2005,28(5):325-329.
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