鄂尔多斯盆地镇泾油田长6储层评价
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摘要
鄂尔多斯盆地是我国第二大内陆沉积盆地,油气资源十分丰富,具有极大的勘探开发潜力。其西南缘镇泾油田的勘探始于70年代,经过近30年的研究,已成为鄂尔多斯盆地重要的产油区,其延长组长6段是主要的产油层段,但对长6段小层的划分与对比存在诸多问题,沉积体系和沉积微相的展布也缺乏统一的认识,主力油层的富集规律和储层的非均质特征等均不明确。论文针对油田当前存在的问题展开研究,为评价和预测该区储层的提供地质依据。
在岩心观察、测井分析及在前人研究成果的基础上,运用高分辨率层序地层学原理,以骨干井为核心,以湖侵泥岩为标志层,对长6地层进行从新划分与对比。利用岩电关系,结合测井曲线形态和组合特征,确定其主要为三角洲前缘沉积;储层主要以水下分流河道砂岩为主,且具有砂体厚度大、成层性好、连续性较好等优点,具有较好的储集物性,而河口坝发育相对较少。并对各微相类型的沉积特征和剖面结构进行了讨论,预测了沉积相的平面展布。
通过物性分析、压汞数据、薄片观察可知,长6砂岩的平均孔隙度为12.1%,平均渗透率为0.26? 10-3| m2,为低孔超低渗储层;孔隙类型主要为粒间残余孔和次生溶孔。平均孔隙半径为16.1| m,平均喉道半径为0.15| m,属于中孔-细喉型储层,孔喉分选及连通较差。四性关系表明长6储层随着砂岩平均粒度的增大,含油级别也相对较高,储层的物性也越好,其日产油量也相对较高。通过大量的试验,取得了适合镇泾油田的泥质含量、孔隙度、渗透率、含水饱和度的区域性经验公式,得出了长6油水层的识别公式,为今后储层评价及优选射孔层段提供理论依据。
通过分析取心段单砂体内部粒度变化序列表明,长6段单砂体主要以复合韵律和反韵律为主。研究区夹层主要为泥质岩类和钙质类,其夹层频率和夹层密度从主河道砂体向河道两翼呈逐渐增大的趋势。对样品渗透率的统计分析表明,从长62-2小层到长63-1小层,渗透率变异系数值变大,突进系数值减小,渗透率极差值变小。而孔隙度(测井二次解释)数据也表明,长62-2地层中,工区西部和中部的砂体孔隙度较大,向两侧孔隙度逐渐减小。长63-1的中部、西部和东部孔隙度较大,向周围孔隙度逐渐减小。
在沉积环境和成岩作用的双重影响下,长6段储层在平面和垂向上均具不同的非均质特征:河道中部的非均质性较弱,而靠近河道侧翼的非均质性较强;而下部长63-1的非均质性强于上部长62-2。其沉积微相对储层的控制作用较明显,砂体厚度、成岩作用等都是影响储层的重要因素,而构造背景对储层的影响不明显。综合多种因素给出了长6储层下限和分类评价标准,将其划分为四类储层,并确定出研究区有利储层主要集中在长62-2小层的中部偏北地区(以Ⅰ类储层为主)和西南部(Ⅱ类储层),而长63-1小层的优质储层则主要集中于研究区的中部(Ⅱ类储层)和南部(Ⅱ类储层)。
Ordos Basin is the second largest inland sedimentation basin with prolific in oil and gas resources, so it has a better exploration and development prospect.Base on the further study of sedimentary system and reservoir Characteristics of chang-6 member in Zhenjing Oilfield, Ordos Basin,and re-recognize the sedimentary facies of main oil layer such as chang-62-2 and chang-63-1,the distribution of sand bodies and oil layer, reservoir Characteristics in chang-62-2 and chang-63-1 is clear .This provide geological theory basis for further reservoir evaluation and development of oil and field late.
Base on the core observation,logging analysis and previous research results,using the high-resolution sequence stratigraphy theory, taking the key wells for centralization and lake transgression mudstone as the marker bed,the chang-6 member is re-devided and re-comparison.Then,use logging curves to classify logging facies based on the lithology-electric property relation. the sedimentary facies is determined to be the front-delta deposition of braided river delta deposits.There is a large thickness,good lamellosity and continuous sandbody,which have good reservoir quality,while the mouthbar is deposited barely. The depositional characterisytics and the structure of microfacies types in sections are discussed, and the lateral distribution of the sedimental facies are predicted.
On the base of physical analysis, mercury injection date, slice observation,the average porosity of chang- 6 is 12.1% ,average permeability is 0.26? 10-3|m 2 , average pore radius is 16.1|m,average throat radius is 0.15|m in chang - 6 member ,so it is considered after the comprehensive reservoir evaluation that it belongs to the type of reservoirs with low porosity and super-low permeability,the middle pore-fine throat,the poor sorting and pore connectivity.
The four properties ' relations shows that the physical properties get better and the daily oil production raises with the increasing of average grain size of sandstone,it?s oil-bearing degree also improved.Both of the territorial empirical formulas of the shale content,porosity, permeability and water saturation and the oil water stratum identification model in Zhenjing Oilfield are conclude by lots of experiments for theoretical basis of the reservoir evaluation and good perforation interval in future.
The grain-size variation internal of coring sandstone tells that it is mainly presents composite and reverse rhythm in chang-6 member. The types of interlayers are argillaceous and calcareous. Frequency and density of the interlayers have a increasing raise from the main channel sand body to river channel flank.Statistical analysis of the permeability showa that the permeability variation coefficient raised and mutation coefficient decreased from chang-62-2 to chang-63-1.The porosity come from log interpretation is better in western and center of study aera in chang-62-2,and in western and eastern in chang-63-1.
After the research on the heterogeneity of the reservoir sandstones, it can be concluded that the heterogeneity resulted from sedimentary environment and diagenesis interaction.the middle of the river channel has poor heterogeneity,and river channel strong.The controlling effect on reservoir by the sedimentary micro-facies is strong.Both the thickness of sandbody and diagenesis are important influenceing factors of reservoir except structure background. The lower limit of reservoir parameters and classification evaluation standard whach can be classified as four types of the Chang-6 member in this oilfield is determined in the paper by considering multivariate factors.The high-quality reservoir is distributed in the central near north(type-Ⅰ) and sourthwest(type-Ⅱ) of study area in chang-62-2,and the central (type-Ⅱ)and sourth(type-Ⅲ) in chang-63-1.
在岩心观察、测井分析及在前人研究成果的基础上,运用高分辨率层序地层学原理,以骨干井为核心,以湖侵泥岩为标志层,对长6地层进行从新划分与对比。利用岩电关系,结合测井曲线形态和组合特征,确定其主要为三角洲前缘沉积;储层主要以水下分流河道砂岩为主,且具有砂体厚度大、成层性好、连续性较好等优点,具有较好的储集物性,而河口坝发育相对较少。并对各微相类型的沉积特征和剖面结构进行了讨论,预测了沉积相的平面展布。
通过物性分析、压汞数据、薄片观察可知,长6砂岩的平均孔隙度为12.1%,平均渗透率为0.26? 10-3| m2,为低孔超低渗储层;孔隙类型主要为粒间残余孔和次生溶孔。平均孔隙半径为16.1| m,平均喉道半径为0.15| m,属于中孔-细喉型储层,孔喉分选及连通较差。四性关系表明长6储层随着砂岩平均粒度的增大,含油级别也相对较高,储层的物性也越好,其日产油量也相对较高。通过大量的试验,取得了适合镇泾油田的泥质含量、孔隙度、渗透率、含水饱和度的区域性经验公式,得出了长6油水层的识别公式,为今后储层评价及优选射孔层段提供理论依据。
通过分析取心段单砂体内部粒度变化序列表明,长6段单砂体主要以复合韵律和反韵律为主。研究区夹层主要为泥质岩类和钙质类,其夹层频率和夹层密度从主河道砂体向河道两翼呈逐渐增大的趋势。对样品渗透率的统计分析表明,从长62-2小层到长63-1小层,渗透率变异系数值变大,突进系数值减小,渗透率极差值变小。而孔隙度(测井二次解释)数据也表明,长62-2地层中,工区西部和中部的砂体孔隙度较大,向两侧孔隙度逐渐减小。长63-1的中部、西部和东部孔隙度较大,向周围孔隙度逐渐减小。
在沉积环境和成岩作用的双重影响下,长6段储层在平面和垂向上均具不同的非均质特征:河道中部的非均质性较弱,而靠近河道侧翼的非均质性较强;而下部长63-1的非均质性强于上部长62-2。其沉积微相对储层的控制作用较明显,砂体厚度、成岩作用等都是影响储层的重要因素,而构造背景对储层的影响不明显。综合多种因素给出了长6储层下限和分类评价标准,将其划分为四类储层,并确定出研究区有利储层主要集中在长62-2小层的中部偏北地区(以Ⅰ类储层为主)和西南部(Ⅱ类储层),而长63-1小层的优质储层则主要集中于研究区的中部(Ⅱ类储层)和南部(Ⅱ类储层)。
Ordos Basin is the second largest inland sedimentation basin with prolific in oil and gas resources, so it has a better exploration and development prospect.Base on the further study of sedimentary system and reservoir Characteristics of chang-6 member in Zhenjing Oilfield, Ordos Basin,and re-recognize the sedimentary facies of main oil layer such as chang-62-2 and chang-63-1,the distribution of sand bodies and oil layer, reservoir Characteristics in chang-62-2 and chang-63-1 is clear .This provide geological theory basis for further reservoir evaluation and development of oil and field late.
Base on the core observation,logging analysis and previous research results,using the high-resolution sequence stratigraphy theory, taking the key wells for centralization and lake transgression mudstone as the marker bed,the chang-6 member is re-devided and re-comparison.Then,use logging curves to classify logging facies based on the lithology-electric property relation. the sedimentary facies is determined to be the front-delta deposition of braided river delta deposits.There is a large thickness,good lamellosity and continuous sandbody,which have good reservoir quality,while the mouthbar is deposited barely. The depositional characterisytics and the structure of microfacies types in sections are discussed, and the lateral distribution of the sedimental facies are predicted.
On the base of physical analysis, mercury injection date, slice observation,the average porosity of chang- 6 is 12.1% ,average permeability is 0.26? 10-3|m 2 , average pore radius is 16.1|m,average throat radius is 0.15|m in chang - 6 member ,so it is considered after the comprehensive reservoir evaluation that it belongs to the type of reservoirs with low porosity and super-low permeability,the middle pore-fine throat,the poor sorting and pore connectivity.
The four properties ' relations shows that the physical properties get better and the daily oil production raises with the increasing of average grain size of sandstone,it?s oil-bearing degree also improved.Both of the territorial empirical formulas of the shale content,porosity, permeability and water saturation and the oil water stratum identification model in Zhenjing Oilfield are conclude by lots of experiments for theoretical basis of the reservoir evaluation and good perforation interval in future.
The grain-size variation internal of coring sandstone tells that it is mainly presents composite and reverse rhythm in chang-6 member. The types of interlayers are argillaceous and calcareous. Frequency and density of the interlayers have a increasing raise from the main channel sand body to river channel flank.Statistical analysis of the permeability showa that the permeability variation coefficient raised and mutation coefficient decreased from chang-62-2 to chang-63-1.The porosity come from log interpretation is better in western and center of study aera in chang-62-2,and in western and eastern in chang-63-1.
After the research on the heterogeneity of the reservoir sandstones, it can be concluded that the heterogeneity resulted from sedimentary environment and diagenesis interaction.the middle of the river channel has poor heterogeneity,and river channel strong.The controlling effect on reservoir by the sedimentary micro-facies is strong.Both the thickness of sandbody and diagenesis are important influenceing factors of reservoir except structure background. The lower limit of reservoir parameters and classification evaluation standard whach can be classified as four types of the Chang-6 member in this oilfield is determined in the paper by considering multivariate factors.The high-quality reservoir is distributed in the central near north(type-Ⅰ) and sourthwest(type-Ⅱ) of study area in chang-62-2,and the central (type-Ⅱ)and sourth(type-Ⅲ) in chang-63-1.
引文
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