三角洲外前缘薄层特低渗储层构型特征——以大情字井油田黑60区块青山口组为例
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摘要
根据岩心、测井、分析化验数据等资料,以大情字井油田黑60区块为例,研究三角洲外前缘薄层特低渗储层的岩相、构型要素、构型级别、砂体展布规律,建立外前缘的构型模式与识别方案。结果表明:外前缘岩相中的块状层理、平行层理、小型槽状交错层理、流水砂纹层理等与外前缘水道和砂坝伴生,泄水构造与包卷层理为三角洲前缘滑塌产生的浊积现象,复合层理的成因为局部水体的频繁进退、湖浪与沿岸流的改造、末端水道的交替溢出及湖泊假潮;外前缘构型具有基准面旋回明显、冲刷切割不明显、低比例朵体与低砂地比、朵体与席状砂共存等特征;与内前缘相比,外前缘泥岩为弱还原色—强还原色、水道化沉积发育较少、席状砂分布广泛、复合层理在砂质沉积中占50%以上,可容纳空间较大,沉降速率较小,能更完整保留整个基准面旋回,有较弱的砂体叠置关系与较低的砂地比,水道宽度较小、厚度较薄;与远砂坝相比,外前缘分选磨圆相对较差,朵体内正韵律与反韵律交替出现,朵体的展布多呈垂直或斜交岸线方向。
This paper takes H60 data in Daqingzijing Oilfield as an example,and uses the core data,well logs,analysis assay data to identify the lithofacies,architecture elements,the hierarchy of depositional units and the distribution of sand body,and establish the architecture model of delta outer-front.Main achievements include:delta outer-front channel and mouth bars often contain massive bedding,parallelbedding,small trough crossbedding,current ripple cross bedding;water escape structure and convolute bedding are interpreted as turbidity phenomena caused by the slip of delta front;the causes of wavy bedding and lenticular bedding are preliminarily determined as the frequent advance and retreat of water,the modification of lake wave and coastal current,the frequent drainage of terminal channel,and the lake pseudotide.The architecture of delta outer-front has the following characteristics:obvious base level cycle,obscure erosion and cutting,low proportion of delta lobe,low net-gross ratio,and delta lobe coexistence with sand sheet.Compared with the delta inner-front,the delta outer-front has the mudstone color from grey to black,the less development channel sediments,the widespread distribution of sand sheet,and the composite bedding account for more than 50% of the sandy sediments,the larger accommodation space and smaller sediment rate,the whole base-level cycle,the weaker superposition of sand body,the lower net-gross ratio,and the smaller and thinner channels.Compared with the distal bar,the sorting and rounding of delta outer-front is worse,and in the lobe of delta outer-front the fining upward cycle and coarsening upward cycle occur alternately,and the distribution of delta outer-front lobe is mostly perpendicular or oblique to the shoreline direction.
This paper takes H60 data in Daqingzijing Oilfield as an example,and uses the core data,well logs,analysis assay data to identify the lithofacies,architecture elements,the hierarchy of depositional units and the distribution of sand body,and establish the architecture model of delta outer-front.Main achievements include:delta outer-front channel and mouth bars often contain massive bedding,parallelbedding,small trough crossbedding,current ripple cross bedding;water escape structure and convolute bedding are interpreted as turbidity phenomena caused by the slip of delta front;the causes of wavy bedding and lenticular bedding are preliminarily determined as the frequent advance and retreat of water,the modification of lake wave and coastal current,the frequent drainage of terminal channel,and the lake pseudotide.The architecture of delta outer-front has the following characteristics:obvious base level cycle,obscure erosion and cutting,low proportion of delta lobe,low net-gross ratio,and delta lobe coexistence with sand sheet.Compared with the delta inner-front,the delta outer-front has the mudstone color from grey to black,the less development channel sediments,the widespread distribution of sand sheet,and the composite bedding account for more than 50% of the sandy sediments,the larger accommodation space and smaller sediment rate,the whole base-level cycle,the weaker superposition of sand body,the lower net-gross ratio,and the smaller and thinner channels.Compared with the distal bar,the sorting and rounding of delta outer-front is worse,and in the lobe of delta outer-front the fining upward cycle and coarsening upward cycle occur alternately,and the distribution of delta outer-front lobe is mostly perpendicular or oblique to the shoreline direction.
引文
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