鄂尔多斯盆地姬塬油田罗1井区长8_1储层地质建模研究
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摘要
鄂尔多斯盆地姬塬油田罗1井区长8_1油藏属于低孔、低渗储层,储层横向变化快,非均质性强。目前,由于处于开发早期,对储层缺乏准确的认识,且尚未建立精细的储层表征参数场,制约了后期的开发工作。因此,对储层进行综合评价,建立精细的三维地质模型具有重要的地质意义。
论文在高分辨率层序地层学的指导下,综合利用岩心、测井等资料,建立了高分辨率等时地层格架,分析了沉积微相的展布演化规律;而后利用测井二次解释资料研究了储层的层内、层间和平面非均质性,并利用模糊数学中的灰色关联理论对储层进行了综合评价,预测了有利区带;最后在层序和沉积的双重控制下,基于Petrel软件建立了研究区的三维地质模型。主要取得了以下研究成果:
1、研究区长8_1油藏可划分为4个短期旋回,自下而上命名为SC1、SC2、SC3和SC4旋回,大致对应于长8_1~(2-2)、长8_1~(2-1)、长8_1~(1-2)和长8_1~(1-1)小层。
2、研究区为三角洲前缘朵叶体沉积,可划分为水下分流河道、分流间湾、河口坝和水下天然堤4种沉积微相。水下分流河道是研究区的骨架砂体,主要发育于长8_1~(1-1)和长8_1~(1-2)小层。
3、研究区属于中-强非均质储层,长8_1~(1-1)小层和长8_1~(1-2)小层水下分流河道迁移摆动频繁,隔夹层多而薄,非均质性较强;长8_1~(2-1)小层隔夹层少而厚,非均质性较弱,长8_1~(2-2)小层则居于二者之间。
4、储层综合研究表明,研究区储层按从好到差可分为三类,其中长8_1~(1-1)和长8_1~(1-2)小层主要发育Ⅰ类和Ⅱ类储层,且长8_1~(1-1)小层的优质储层主要发育于井区西北部,长8_1~(1-2)小层的优质储层主要发育于井区西南部。而长8_1~(2-1)小层主要发育Ⅱ类和Ⅲ类储层,长8_1~(2-2)小层则主要发育Ⅲ类储层。
5、基于Petrel软件,应用随机序贯指示模拟法和序贯高斯模拟法建立了长8_1油藏的沉积微相模型、砂体骨架模型、孔隙度模型、渗透率模型和含水饱和度模型,实现了储层的横向预测优选,模拟结果与地质认识相符。
Chang 8_1 reservoir of Luo1 area in Jiyuan oilfield of Ordos basin are characterized by low porosity and permeability,rapid change of lithology and facies, and strong heterogeneity.The later work has been restricted because it is in the early development stage,lacking of accurate reservoir evaluation and reservoir parameters. Therefore,it is very important to evaluate reservoir comprehensively and build accurate three-dimensional geological model.
On the basis of comprehensive study of cores,log wells and so on,taking the high resolution sequence stratigraphic theory as a direction,the sequence framework has been established and the distribution and evolution laws of microfacies have been analyzed.Then the text studied in-layer heterogeneity,between-layer heterogeneity and plane heterogeneity of Chang 8_1 reservoir by using log interpretation parameters, evaluated reservoir comprehensively on the theory of grey correlation analysis,and predicted the favorable reservoirs.At last,under the control of sequence and sedimentary,built the geological model with the software of Petrel.Follwing achievements have been obtained in this thesis:
1.Chang 8_1 reservoir can be divided into four short-cycles in ascending order (SC1,SC2,SC3 and SC4),which were corresponding to Chang 8_1~(2-2),Chang8_1~(2-1), Chang8_1~(1-2) and Chang8_1~(1-1) respectively.
2.Chang 8_1 reservoir belongs to delta front deposition,which can be divided into subaqueous distributary channel,subaqueous interdistributary bay,mouth bar and subaqueous natural barrier.And subaqueous distributary channel is the major microfacies,which mainly developed in Chang 8_1~(1-1) and Chang 8_1~(1-2)
3.The reservoir shows middle-strong heterogeneity,and the reservoir heterogeneity of Chang 8_1~(1-1) and Chang 8_1~(1-2) are stronger,because the migration of the subaqueous distributary channels are frequent,and the interbeds are more and thin. While the the interbeds of Chang 8_1~(2-1) are less and thick,the reservoir heterogeneity of it is weak,and the reservoir heterogeneity of Chang 8_1~(2-2) is medium.
4.According to comprehensive reservoir evaluation,Chang 8_1 reservoir can be divided into three types,the first type is the best,the second type is better,and the third type is the worst.Chang 8_1~(1-1) and Chang 8_1~(1-2) mainly develop the first type and the second type,and high quality reservoir of Chang 8_1~(1-1) are located in northwest,and those of Chang 8_1~(1-2) are located in southwest.While Chang 8_1~(2-1) mainly develop the second type and the third type,and Chang 8_1~(2-2) mainly develop the third type.
5.With the software of Petrel,using the stochastic methods of Sequence Indicator Simulation and Sequence Guass Simulation,established the geological models of Chang 8_1 reservoir,which include sedimentary facies model,sand model,porosity model,permeability model and water saturation model.The reasonable prediction results are consistent to geological knowledge,which realize the lateral prediction of reservoir.
论文在高分辨率层序地层学的指导下,综合利用岩心、测井等资料,建立了高分辨率等时地层格架,分析了沉积微相的展布演化规律;而后利用测井二次解释资料研究了储层的层内、层间和平面非均质性,并利用模糊数学中的灰色关联理论对储层进行了综合评价,预测了有利区带;最后在层序和沉积的双重控制下,基于Petrel软件建立了研究区的三维地质模型。主要取得了以下研究成果:
1、研究区长8_1油藏可划分为4个短期旋回,自下而上命名为SC1、SC2、SC3和SC4旋回,大致对应于长8_1~(2-2)、长8_1~(2-1)、长8_1~(1-2)和长8_1~(1-1)小层。
2、研究区为三角洲前缘朵叶体沉积,可划分为水下分流河道、分流间湾、河口坝和水下天然堤4种沉积微相。水下分流河道是研究区的骨架砂体,主要发育于长8_1~(1-1)和长8_1~(1-2)小层。
3、研究区属于中-强非均质储层,长8_1~(1-1)小层和长8_1~(1-2)小层水下分流河道迁移摆动频繁,隔夹层多而薄,非均质性较强;长8_1~(2-1)小层隔夹层少而厚,非均质性较弱,长8_1~(2-2)小层则居于二者之间。
4、储层综合研究表明,研究区储层按从好到差可分为三类,其中长8_1~(1-1)和长8_1~(1-2)小层主要发育Ⅰ类和Ⅱ类储层,且长8_1~(1-1)小层的优质储层主要发育于井区西北部,长8_1~(1-2)小层的优质储层主要发育于井区西南部。而长8_1~(2-1)小层主要发育Ⅱ类和Ⅲ类储层,长8_1~(2-2)小层则主要发育Ⅲ类储层。
5、基于Petrel软件,应用随机序贯指示模拟法和序贯高斯模拟法建立了长8_1油藏的沉积微相模型、砂体骨架模型、孔隙度模型、渗透率模型和含水饱和度模型,实现了储层的横向预测优选,模拟结果与地质认识相符。
Chang 8_1 reservoir of Luo1 area in Jiyuan oilfield of Ordos basin are characterized by low porosity and permeability,rapid change of lithology and facies, and strong heterogeneity.The later work has been restricted because it is in the early development stage,lacking of accurate reservoir evaluation and reservoir parameters. Therefore,it is very important to evaluate reservoir comprehensively and build accurate three-dimensional geological model.
On the basis of comprehensive study of cores,log wells and so on,taking the high resolution sequence stratigraphic theory as a direction,the sequence framework has been established and the distribution and evolution laws of microfacies have been analyzed.Then the text studied in-layer heterogeneity,between-layer heterogeneity and plane heterogeneity of Chang 8_1 reservoir by using log interpretation parameters, evaluated reservoir comprehensively on the theory of grey correlation analysis,and predicted the favorable reservoirs.At last,under the control of sequence and sedimentary,built the geological model with the software of Petrel.Follwing achievements have been obtained in this thesis:
1.Chang 8_1 reservoir can be divided into four short-cycles in ascending order (SC1,SC2,SC3 and SC4),which were corresponding to Chang 8_1~(2-2),Chang8_1~(2-1), Chang8_1~(1-2) and Chang8_1~(1-1) respectively.
2.Chang 8_1 reservoir belongs to delta front deposition,which can be divided into subaqueous distributary channel,subaqueous interdistributary bay,mouth bar and subaqueous natural barrier.And subaqueous distributary channel is the major microfacies,which mainly developed in Chang 8_1~(1-1) and Chang 8_1~(1-2)
3.The reservoir shows middle-strong heterogeneity,and the reservoir heterogeneity of Chang 8_1~(1-1) and Chang 8_1~(1-2) are stronger,because the migration of the subaqueous distributary channels are frequent,and the interbeds are more and thin. While the the interbeds of Chang 8_1~(2-1) are less and thick,the reservoir heterogeneity of it is weak,and the reservoir heterogeneity of Chang 8_1~(2-2) is medium.
4.According to comprehensive reservoir evaluation,Chang 8_1 reservoir can be divided into three types,the first type is the best,the second type is better,and the third type is the worst.Chang 8_1~(1-1) and Chang 8_1~(1-2) mainly develop the first type and the second type,and high quality reservoir of Chang 8_1~(1-1) are located in northwest,and those of Chang 8_1~(1-2) are located in southwest.While Chang 8_1~(2-1) mainly develop the second type and the third type,and Chang 8_1~(2-2) mainly develop the third type.
5.With the software of Petrel,using the stochastic methods of Sequence Indicator Simulation and Sequence Guass Simulation,established the geological models of Chang 8_1 reservoir,which include sedimentary facies model,sand model,porosity model,permeability model and water saturation model.The reasonable prediction results are consistent to geological knowledge,which realize the lateral prediction of reservoir.
引文
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崔树清,刘雪军.高尚堡油田沙河街组三段Es_3~(2+3)亚段储层非均质性研究[J].西安石油大学学报:自然科学版,2005,20(2):22-24
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邓宏文,王宏亮,祝永军.高分辨率层序地层学-原理与运用[M].北京:地质出版社,2002
黄春菊,陈开远.高分辨率层序地层学的研究现状、研究内容及研究方法综述[J].地球科学进展,2002
冯国庆,李允.运用序贯指示模拟方法模拟沉积微相[J].西南石油学院学报,2001,23(2):1-4
桂峰,黄智辉,马正.利用相控模型进行井间参数预测[J].地球科学,2001,26(1):49-53
郭彦如,刘化清,李相博.大型坳陷湖盆层序地层格架的研究方法体系—以鄂尔多斯盆地中生界延长组为例[J].沉积学报,2008,26(3):384-391
姜在兴.沉积学[M].北京:石油工业出版社,2003
刘波,赵翰卿,于会宇.储集层的两种精细对比方法讨论[J].石油勘验与开发,2001,28(6):94-96
刘吉余,彭志春,郭晓博.灰色关联分析在储层评价中的运用-以大庆萨尔图油田北二区为例[J].油气地质与采收率,2005,12(2):13-15
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李少华,张尚锋,张昌民,等.沉积微相控制下的储层物性参数建模[J].江汉石油学院学报,2003,25(1):24-26
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