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老君庙油田K层沉积相研究
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摘要
老君庙油田位于酒泉盆地老君庙背斜带的中部,是一北陡南缓的不对称背斜油田,第三系白杨河组K油层组是其重要的含油层位。经过几十年开采,油田已经进入高含水开发阶段,但是,对于K层沉积相的研究仍然处于很低的程度,K层的沉积相展布及沉积微相特征都没有系统的认识。
     为了提高精细勘探力度,本文充分吸收前人研究成果,以沉积学的基本理论和方法为指导,综合地球物理、地球化学、盆地分析、古地貌恢复等多种理论和方法,研究了K油层组的沉积相类型和沉积相展布规律,对K油层组进行了地层对比与划分,。
     在地层划分比对中,以K层稳定分布的2段泥岩层以及测井曲线明显的山字形特征为标志层,通过沉积旋回划分,将K油层组划分为K3、K2、K1,3个小层,并且发现由于K地层受到逆冲推覆作用,在老君庙背斜顶部部分井位出现了K地层垂向重复,出现2K、3K地层。
     通过岩石类型、沉积构造、古生物标志、沉积旋回、岩性-电性响应特征、野外露头、测井资料、钻井岩芯观察等多种手段分析,识别出老君庙油田K层为三角洲前缘沉积亚相,发育水下分流河道、水下分流间湾、水下决口扇、水下天然堤等微相。
     研究区为三角洲前缘沉积,发育多条水下分流河道,呈南东-北西向宽带状展布,沉积相平面展布特征控制砂体展布,砂体连片性好,呈席状大面积分布于河道区域,是有利的油藏储集体。
Laojunmiao oilfield is located in the middle of Laojunmiao anticline belt in Jiuquan Basin, which is an asymmetry anticline oilfield with steep northern and slow southern. The K reservoir of Tertiary Oligocene Baiyanghe Formation is an important oil-bearing. After decades of mining, Oilfield has entered the stage of high water containing development. K layer of sedimentary facies and sedimentary facies are no systematic the sedimentary research of K layer is still in a very low level, the sedimentary facies and microfacies of K layer haven't got systematic researched.
     To improve the precision exploration efforts, Based on the previous research results and exploration data and guided by fundamental sediment logical theory and means, the partition and contrast of K layer, the paper studies sedimentary facies types and distribution of sedimentary facies of The K layer of Tertiary Baiyanghe Formation on the basis of geophysics, geochemistry, basin analysis and ancient landscape restoration。
     In the partition and contrast of k layer, the two stable distribution mud rock and the mountain-shaped logging feature was marked by layer, the K layer was divided into K3, K2, K1 three small layers as by sedimentary cycle. By the role of thrusting, K layer appeared repeatedly in the part of the wells in the top of Laojunmiao anticline was called 2K,3K.
     Based on the rock types, sedimentary structures, paleontology signs, sedimentary cycles, lithologic-electrical response characteristics, outcrop, well log data, observation of drilling cores, outcrop, etc. the paper points out that the sedimentary facies in the study area is delta front in the studied area, including the distributary channel deposits, the inter-distrbutary deposits, subaqueous crevasse splay, subaqueous natural levee.
     The study area belongs to delta front sediment and develops several SE-NW directional underwater distributary channels. The distribution of sand body is controlled by the distribution of sedimentary facies. The sand body is well continued to each other, and widely distributed as sheet sandstone in channel, which is the favorable zone for oil reservoir.
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