鄂尔多斯盆地大牛地气田盒3段河道砂岩相控储层预测
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摘要
鄂尔多斯盆地大牛地气田二叠系下石盒子组盒3段属于典型的河流相沉积,由于地震属性预测受地震分辨率限制,造成河道砂体储层预测的多解性。应用高分辨率层序地层学,对盒3段目的层进行了沉积相展布规律研究,认清了盒3段顶界面地震反射层Tf9是一个在全区有近似等时地质意义的反射界面,盒3段上砂组的厚度与Tf9平均振幅的统计关系符合调谐振幅原理,从而优选出盒3段砂岩的振幅敏感属性。通过地震相、测井相及沉积微相综合分析,认为盒3段振幅敏感属性平面图与其沉积相展布规律一致,通过相关分析能较好地预测出砂岩发育的有利区。在D66井附近目标区的实践表明,砂岩预测结果与实钻吻合率达90%。由此表明,以沉积相、沉积特征约束地震属性预测能实现对复杂地质体的准确预测和描述。
The reservoirs of the 3rd member of the Permian Lower Shihezi Formation(P1h3) in the Daniudi gas field in the Ordos Basin are typical fluvial deposits.As reservoir prediction with seismic attributes is constrained by seismic resolution,uncertainty occurs in the prediction of channel sandstone reservoirs.High-resolution sequence stratigraphy is applied in this paper to figure out the distribution pattern of sedimentary facies of the targets in P1h3.It has been made clear that the seismic reflector on the top of P1h3(Tf9) has the geologic significance of an approximate isochronous surface in the whole study area.The relationship between the thickness of the upper sandstone interval in P1h3 and the average amplitude of Tf9 conforms to the principle of tuning amplitude.Thus,the amplitude attributes that are sensitive to the sandstone in the P1h3 are optimized.According to integrated analyses of seismic facies,logging facies and sedimentary microfacies,it is thought that the plan view of sensitive amplitude attribute of P1h3 is consistent with the distribution pattern of sedimentary facies.Favorable zones for sandstone development could be predicted through relevant analysis.Application in area near the D66 well shows that 90% of the prediction matches the real drilling results.Therefore,under the constraints of sedimentary microfacies and sedimentary characteristics,seismic attributions can be used to accurately predict and characterize complex reservoirs.
The reservoirs of the 3rd member of the Permian Lower Shihezi Formation(P1h3) in the Daniudi gas field in the Ordos Basin are typical fluvial deposits.As reservoir prediction with seismic attributes is constrained by seismic resolution,uncertainty occurs in the prediction of channel sandstone reservoirs.High-resolution sequence stratigraphy is applied in this paper to figure out the distribution pattern of sedimentary facies of the targets in P1h3.It has been made clear that the seismic reflector on the top of P1h3(Tf9) has the geologic significance of an approximate isochronous surface in the whole study area.The relationship between the thickness of the upper sandstone interval in P1h3 and the average amplitude of Tf9 conforms to the principle of tuning amplitude.Thus,the amplitude attributes that are sensitive to the sandstone in the P1h3 are optimized.According to integrated analyses of seismic facies,logging facies and sedimentary microfacies,it is thought that the plan view of sensitive amplitude attribute of P1h3 is consistent with the distribution pattern of sedimentary facies.Favorable zones for sandstone development could be predicted through relevant analysis.Application in area near the D66 well shows that 90% of the prediction matches the real drilling results.Therefore,under the constraints of sedimentary microfacies and sedimentary characteristics,seismic attributions can be used to accurately predict and characterize complex reservoirs.
引文
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12陆基孟.地震勘探原理[M].北京:石油大学出版社,1993
13程浪洪.塔里木盆地轮古西地区多地震属性储层综合预测[J].油气地质与采收率,2007,14(3):70～72
14刘保国.实用地震沉积学在沉积相分析中的应用[J].石油物探,2008,47(3):266～271
15汤卫民,阎魏.一种基于线性回归的软件类比估算方法[J].计算机工程与科学,2008,30(12):149～152
2关达,张卫华,管路平,等.相控储层预测技术及其在大牛地气田D井区的应用[J].石油物探,2006,45(3):231～233
3刘忠群.大牛地气田盒3段三维地震储层预测研究[J].勘探地球物理进展,2008,31(2):133～136
4谯述蓉,张虹,赵爽.川西DY地区须家河组致密砂岩储层预测技术及应用效果分析[J].石油与天然气地质,2008,29(6):774～780
5罗东明,谭学群,游瑜春,等.沉积环境复杂地区地层划分对比方法—以鄂尔多斯盆地大牛地气田为例[J].石油与天然气地质,2008,29(1):38～43
6樊太亮,吕延仓,丁明华.层序地层体制中的陆相储层发育规律[J].地学前缘,2000,7(4):315～321
7张尚锋,张昌民,李少华.高分辨率层序地层学理论与实践[M].北京:石油工业出版社,2007.9～19
8周心怀,王昕,魏刚,等.辽中中洼东陡坡带古近系层序地层格架控制下的储层预测[J].中国海上油气,2007,19(5):306～310
9夏庆龙,赵志超,赵宪生.渤海浅部储层沉积微相与地球物理参数关系的研究[J].天然气工业,2004,24(5):51～55
10宋子齐,赵宏宇,唐长久,等.利用测井资料研究特低渗储层的沉积相带[J].石油地质与工程,2006,20(6):18～25
11李德江,朱筱敏,杨俊生.苏丹Muglael盆地Fula坳陷白垩系Abu Gabra组地震相研究[J].石油与天然气地质,2007,28(1):51～58
12陆基孟.地震勘探原理[M].北京:石油大学出版社,1993
13程浪洪.塔里木盆地轮古西地区多地震属性储层综合预测[J].油气地质与采收率,2007,14(3):70～72
14刘保国.实用地震沉积学在沉积相分析中的应用[J].石油物探,2008,47(3):266～271
15汤卫民,阎魏.一种基于线性回归的软件类比估算方法[J].计算机工程与科学,2008,30(12):149～152
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