乌尔禾油田乌36井区块三叠系百口泉组沉积体系与储层特征研究
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摘要
乌尔禾油田位于准噶尔盆地西北缘乌夏断裂带西段。该区三叠系百口泉组砂体发育,可作为今后油藏评价的重要接替区块。虽然对该区的研究已有几十年的历史,但前期主要的勘探层位为二叠系和三叠系克拉玛依组,针对百口泉组仅作了一些初步研究工作,精细到油层组级别的沉积体系研究以及优质储层分布等研究工作还没有开展过。
本文利用沉积学、石油地质学的基本理论,根据岩心观察、测井及各种薄片资料对乌尔禾油田乌36井区块三叠系百口泉组物源、沉积体系、储层特征等进行了综合研究,阐述了有利储层的控制因素以及空间展布的范围。
在综合应用高分辨率层序地层学旋回等时对比的基础上,对乌尔禾油田乌36井区块三叠系百口泉组91口井进行了地层划分与对比。将百口泉组地层划分为一个长期基准面上升半旋回、三个中期旋回、七个短期旋回,短期旋回的划分与砂体发育期次对应。据此,建立了研究区三叠系百口泉组的精细等时地层格架。
通过对研究区砂岩骨架矿物、重矿物以及砂体的展布特征等进行研究,确定了研究区三叠系百口泉组物源主要来自于东北方向。此外,根据岩心、录井、测井以及岩心分析化验资料对研究区三叠系百口泉组沉积体系进行了研究,研究表明百口泉组发育冲积扇沉积体系,可划分为扇中亚相,扇缘亚相及扇间洼地亚相；平面上沉积微相划分为；辫状河道充填沉积、筛状沉积、泥石流沉积及扇缘片流沉积；T1b3是研究区主要的含油储集层段,为扇中亚相的筛状沉积或辫状河道充填沉积。
通过岩石学及储层微观特征研究确定了研究区百口泉组储层特征,研究表明百口泉组储层孔隙度为2.1%～28.7%,平均16.26%；渗透率0.08mD～1798.59mD,平均17.67mD。储集空间类型主要为剩余原生粒间孔,孔隙类型为小孔、中细喉-细吼孔隙,储层综合评价为中孔低渗储层,进一步将储层分为3类,并确定了各种类型储层的空间分布范围。最后对优质储层发育的控制因素进行了研究,研究表明沉积微相及储层成岩作用是控制优质储层发育的主要因素。
Wuerhe oil field is located in Wu-Xia fault belt in northwestern margin of Junggar Basin.The sand body of Baikouquan formation is developing in this area, which can be important replacement block in the following reservoir evaluation in this area. Although research in the area has several years of history but mainly for exploration early Permian and Triassic Karamay group, for Baikouquan formation only made some preliminary studies, fine to the oil reservoir level the sedimentary system and the distribution of reservoir quality work is not carried out.
The Paper, referring to modern sedimentology and Petroleum Geology,deeply studies the provenance, sedimentary characteristics and reservoir of Baikouquan formation of.Wu36 Well block in Wuerhe oil field with core observation,logging, slice analysis, systemically analyzed the controlling factors of the advantageous reservoir and the distribution.
With synthetic application of high resolution sequence stratigraphy and cycle isochronous correlation technology,91 wells were stratigraphic division and correlation. The Baikouquan formation of Triassic in Wuerhe oilfield can be divided into one long-stage semi-cycle,three mid-stage cycles and seven short-stage cycles which are in correspondence with the sandbody development period In the end, delicate sequence stratigraphic framework of Baikouquan Formation of Triassic is built according to these rules.
The features of sandstone matrix minerals, heavy minerals and sand body distribution of characteristics of studies identified in the study area Baikouquan group is mainly derived from the northeast. Moreover, according to core logging, core analysis the author studies the sedimentary system of Baikouquan formation of Triassic in research zone.studies show that Baikouquan alluvial fan depositional system, which can be divided into the middle-fan subfacies and the front-fan subfacies and the inter-fan depressions,On the plane, the above subfacies can be divided into braided fluvial channel, cribellate deposit, mudflow deposit, front-fan sheetflod deposit, T1b3 is the important reservoir in study area,which belongs to braided fluvial channel filled Sedimentary and cribellate deposits.
By petrology and reservoir microscopic characteristics of the study area to determine Baikouquan reservoir characteristics, study shows Baikouquan porosity 2.1% and 28.7%, average 16.26%; permeability 0.08mD and 1798.59mD, Average 17.67mD. The main types of storage space remaining primary intergranular pores, pore type holes, the small jets-small roar pore, comprehensive evaluation of reservoir porosity and permeability reservoir, the reservoir further divided into three categories, and identified spatial distribution of various types of reservoirs. Finally, quality control factors for reservoir development studies, research shows that sedimentary facies and diagenesis control the quality reservoir development factors.
本文利用沉积学、石油地质学的基本理论,根据岩心观察、测井及各种薄片资料对乌尔禾油田乌36井区块三叠系百口泉组物源、沉积体系、储层特征等进行了综合研究,阐述了有利储层的控制因素以及空间展布的范围。
在综合应用高分辨率层序地层学旋回等时对比的基础上,对乌尔禾油田乌36井区块三叠系百口泉组91口井进行了地层划分与对比。将百口泉组地层划分为一个长期基准面上升半旋回、三个中期旋回、七个短期旋回,短期旋回的划分与砂体发育期次对应。据此,建立了研究区三叠系百口泉组的精细等时地层格架。
通过对研究区砂岩骨架矿物、重矿物以及砂体的展布特征等进行研究,确定了研究区三叠系百口泉组物源主要来自于东北方向。此外,根据岩心、录井、测井以及岩心分析化验资料对研究区三叠系百口泉组沉积体系进行了研究,研究表明百口泉组发育冲积扇沉积体系,可划分为扇中亚相,扇缘亚相及扇间洼地亚相；平面上沉积微相划分为；辫状河道充填沉积、筛状沉积、泥石流沉积及扇缘片流沉积；T1b3是研究区主要的含油储集层段,为扇中亚相的筛状沉积或辫状河道充填沉积。
通过岩石学及储层微观特征研究确定了研究区百口泉组储层特征,研究表明百口泉组储层孔隙度为2.1%～28.7%,平均16.26%；渗透率0.08mD～1798.59mD,平均17.67mD。储集空间类型主要为剩余原生粒间孔,孔隙类型为小孔、中细喉-细吼孔隙,储层综合评价为中孔低渗储层,进一步将储层分为3类,并确定了各种类型储层的空间分布范围。最后对优质储层发育的控制因素进行了研究,研究表明沉积微相及储层成岩作用是控制优质储层发育的主要因素。
Wuerhe oil field is located in Wu-Xia fault belt in northwestern margin of Junggar Basin.The sand body of Baikouquan formation is developing in this area, which can be important replacement block in the following reservoir evaluation in this area. Although research in the area has several years of history but mainly for exploration early Permian and Triassic Karamay group, for Baikouquan formation only made some preliminary studies, fine to the oil reservoir level the sedimentary system and the distribution of reservoir quality work is not carried out.
The Paper, referring to modern sedimentology and Petroleum Geology,deeply studies the provenance, sedimentary characteristics and reservoir of Baikouquan formation of.Wu36 Well block in Wuerhe oil field with core observation,logging, slice analysis, systemically analyzed the controlling factors of the advantageous reservoir and the distribution.
With synthetic application of high resolution sequence stratigraphy and cycle isochronous correlation technology,91 wells were stratigraphic division and correlation. The Baikouquan formation of Triassic in Wuerhe oilfield can be divided into one long-stage semi-cycle,three mid-stage cycles and seven short-stage cycles which are in correspondence with the sandbody development period In the end, delicate sequence stratigraphic framework of Baikouquan Formation of Triassic is built according to these rules.
The features of sandstone matrix minerals, heavy minerals and sand body distribution of characteristics of studies identified in the study area Baikouquan group is mainly derived from the northeast. Moreover, according to core logging, core analysis the author studies the sedimentary system of Baikouquan formation of Triassic in research zone.studies show that Baikouquan alluvial fan depositional system, which can be divided into the middle-fan subfacies and the front-fan subfacies and the inter-fan depressions,On the plane, the above subfacies can be divided into braided fluvial channel, cribellate deposit, mudflow deposit, front-fan sheetflod deposit, T1b3 is the important reservoir in study area,which belongs to braided fluvial channel filled Sedimentary and cribellate deposits.
By petrology and reservoir microscopic characteristics of the study area to determine Baikouquan reservoir characteristics, study shows Baikouquan porosity 2.1% and 28.7%, average 16.26%; permeability 0.08mD and 1798.59mD, Average 17.67mD. The main types of storage space remaining primary intergranular pores, pore type holes, the small jets-small roar pore, comprehensive evaluation of reservoir porosity and permeability reservoir, the reservoir further divided into three categories, and identified spatial distribution of various types of reservoirs. Finally, quality control factors for reservoir development studies, research shows that sedimentary facies and diagenesis control the quality reservoir development factors.
引文
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