东辛地区盐22区块砂砾岩体储层研究
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摘要
东营凹陷东辛盐22区块砂砾岩体储层发育,但扇体为多期快速沉积,纵向上多期叠合,平面上交叉叠置展布,形成了复杂的沉积格局,因此其沉积期次划分就显得尤为重要。在前人研究的基础上,以构造地质学、沉积学等理论为指导,综合利用地震、岩心、测井、录井及分析化验等资料,对东辛盐22地区的构造、沉积期次和沉积体系特征进行了系统研究,并分析了构造对沉积的控制作用,这对于该区的储层预测及有利油气富集区优选具有重要的指导意义。
从三维地震资料入手,借助地震反演,通过统计砂砾岩厚度及砂砾岩百分含量,单井测井资料解释,结合沉积背景资料分析,该区位于北部陡坡带,陈南断裂控制了砂体展布,物源来自北部,对应盐16古冲沟,在沙四段沉积时期主要发育近岸水下扇沉积。沙四段沉积早期,水体较浅,扇体为快速混杂堆积。之后水体逐渐变深,扇体逐渐往北后移,造成多期扇体叠加。
综合运用岩心、测井和地震资料对东辛地区盐22区块沙河街组四段进行了沉积期次划分,将目的层段划分为12个期次,发育多个沉积旋回,且主要是正旋回。运用井—震结合的方法,以沉积期次划分为地层对比单元,进行地层对比,建立了东辛地区盐22区块沙河街组四段的沉积地层格架。
通过岩心观察、薄片观察和粒度分析确定了研究区的沉积相类型,东辛地区盐22区块沙河街组四段发育近岸水下扇相和滑塌浊积扇相,以近岸水下扇扇中亚相沉积为主,主要发育主水道、辫状水道、辫状水道间等微相,结合测井相应特征建立了各微相的沉积模式。通过砂砾岩厚度统计、砂砾岩百分含量分析及地震反射构型分析综合判定,研究区受北部物源控制。在以上研究的基础上进行了剖面相对比和平面相分析,揭示了该区沉积体系的时空展布规律。
Glutinite Bodies reservoir develops in yan22,dongxin area dongying depression. Those fans are rapid sedimentary for many stages, which are overlapped longitudinally, across in plane, forming a complex layout. So it’s very important to divide the sedimentary stage. On the base of predecessors’study, guided by the theory of structural geology, sedimentation and so on, and comprehensive utilization of seismic, core, well logging and the analyzed data, the structure, sedimentary stage and the sediment system were systematic studied. The control action of structure to the sedimentary was also analyzed. That has important guiding significance for the forecasting of reservoir and the preference of oil and gas cluster region.
Starting from 3D seismic, with the help of seismic inversion, through the statistics of glutenite’thickness and percentage composition, the analyze of well’s logging data, combine the analysis of sedimentary background, we get that: the study area is located at the north steep slope zone. Chennan fault controls the sandstone body distribution. The source is from the north, corresponding the yan16 old gully. It mainly develops nearshore subaqueous fans during the fourth sections of shahejie formation. At the early of the fourth sections of shahejie formation, the water is low, and the fans are rapid mess sedimentary. After that, the water becomes deeper and deeper, the fans gradual moves towards north. That makes fans overlay.
Integrated application of core, logging and seismic data, the sedimentary stage of the fourth sections of shahejie formation was divided, yan22 Dongxin area. The object interval was divided into 12 stages. It also develops many sedimentary cycles and mainly are normal cycle. Combine the logging and seismic, use the divided stage as the stratigraphic correlation cell, carry on the stratigraphic correlation, that build the sedimentary stratigraphic framework of the fourth sections of shahejie formation, yan22 Dongxin area.
Through observation of core sample and thin slice and size analysis, the study area’s sedimentary facies were fixed. It develops nearshore subaqueous fan and slumping turbidite fan during the fourth sections of shahejie formation, yan22 Dongxin area. Subfacies are mostly nearshore subaqueous fan’s midfan. Microfacies are main channel, braided channel and braided interchannel. The microfacies’sedimentation model was built combing the logging character. The study area is controlled by the north source according to statistics of glutenite’thickness and percentage composition, seismic reflection configuration. On the base of above research, the profile and in-plane phasing were analyzed, and the sedimentary system’s layout rule of time and space was also revealed.
从三维地震资料入手,借助地震反演,通过统计砂砾岩厚度及砂砾岩百分含量,单井测井资料解释,结合沉积背景资料分析,该区位于北部陡坡带,陈南断裂控制了砂体展布,物源来自北部,对应盐16古冲沟,在沙四段沉积时期主要发育近岸水下扇沉积。沙四段沉积早期,水体较浅,扇体为快速混杂堆积。之后水体逐渐变深,扇体逐渐往北后移,造成多期扇体叠加。
综合运用岩心、测井和地震资料对东辛地区盐22区块沙河街组四段进行了沉积期次划分,将目的层段划分为12个期次,发育多个沉积旋回,且主要是正旋回。运用井—震结合的方法,以沉积期次划分为地层对比单元,进行地层对比,建立了东辛地区盐22区块沙河街组四段的沉积地层格架。
通过岩心观察、薄片观察和粒度分析确定了研究区的沉积相类型,东辛地区盐22区块沙河街组四段发育近岸水下扇相和滑塌浊积扇相,以近岸水下扇扇中亚相沉积为主,主要发育主水道、辫状水道、辫状水道间等微相,结合测井相应特征建立了各微相的沉积模式。通过砂砾岩厚度统计、砂砾岩百分含量分析及地震反射构型分析综合判定,研究区受北部物源控制。在以上研究的基础上进行了剖面相对比和平面相分析,揭示了该区沉积体系的时空展布规律。
Glutinite Bodies reservoir develops in yan22,dongxin area dongying depression. Those fans are rapid sedimentary for many stages, which are overlapped longitudinally, across in plane, forming a complex layout. So it’s very important to divide the sedimentary stage. On the base of predecessors’study, guided by the theory of structural geology, sedimentation and so on, and comprehensive utilization of seismic, core, well logging and the analyzed data, the structure, sedimentary stage and the sediment system were systematic studied. The control action of structure to the sedimentary was also analyzed. That has important guiding significance for the forecasting of reservoir and the preference of oil and gas cluster region.
Starting from 3D seismic, with the help of seismic inversion, through the statistics of glutenite’thickness and percentage composition, the analyze of well’s logging data, combine the analysis of sedimentary background, we get that: the study area is located at the north steep slope zone. Chennan fault controls the sandstone body distribution. The source is from the north, corresponding the yan16 old gully. It mainly develops nearshore subaqueous fans during the fourth sections of shahejie formation. At the early of the fourth sections of shahejie formation, the water is low, and the fans are rapid mess sedimentary. After that, the water becomes deeper and deeper, the fans gradual moves towards north. That makes fans overlay.
Integrated application of core, logging and seismic data, the sedimentary stage of the fourth sections of shahejie formation was divided, yan22 Dongxin area. The object interval was divided into 12 stages. It also develops many sedimentary cycles and mainly are normal cycle. Combine the logging and seismic, use the divided stage as the stratigraphic correlation cell, carry on the stratigraphic correlation, that build the sedimentary stratigraphic framework of the fourth sections of shahejie formation, yan22 Dongxin area.
Through observation of core sample and thin slice and size analysis, the study area’s sedimentary facies were fixed. It develops nearshore subaqueous fan and slumping turbidite fan during the fourth sections of shahejie formation, yan22 Dongxin area. Subfacies are mostly nearshore subaqueous fan’s midfan. Microfacies are main channel, braided channel and braided interchannel. The microfacies’sedimentation model was built combing the logging character. The study area is controlled by the north source according to statistics of glutenite’thickness and percentage composition, seismic reflection configuration. On the base of above research, the profile and in-plane phasing were analyzed, and the sedimentary system’s layout rule of time and space was also revealed.
引文
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