渤海灣渤中C地區分流河道砂體油氣富集規律及滾動開發實踐

周軍良+胡勇+李超+謝京+耿紅柳

摘 要：淺水三角洲分流河道砂體是渤海灣渤中C地區最具含油潛力的砂體類型，也是該區后期滾動挖潛的主要對象。以區域晚期成藏理論為指導，結合探井、開發井揭示的油氣分布特征，以統計學為手段，弄清分流河道砂體的油氣富集規律，對已開發或未開發分流河道砂體的潛力進行定量化分析，為滾動開發實踐提供依據。結果表明：該區含油分流河道砂體平面上主要分布在渤中C地區主控斷層平面距離5 km以內的區域，縱向上主要集中在海拔-1 780～-1 650 m之間；油氣的富集程度平面上受控于構造背景和斷砂的接觸關系，位于面積大的圈閉內并與斷層高角度接觸的分流河道砂體油氣相對富集，縱向上受控于各層位基準面旋回差異及分流河道砂體規模的大小，發育于基準面上升半旋回中晚期且在單一區塊內面積小于5 km2的分流河道砂體往往具有較高的面積充滿度。實踐證實，該成果較好指導了該區的滾動開發實踐，有助于油田的高效開發評價，對類似區塊的勘探及滾動開發評價具有重要的指導意義。

關鍵詞：油氣分布；分流河道砂體；淺水三角洲；明化鎮組；富集規律；井位部署；潛力評價；渤海灣

中圖分類號：P618.13；TE122 文獻標志碼：A

文章編號：1672-6561（2016）05-0685-09

Abstract： Distributary channel sandbody of shallow water delta is the most potential oil-bearing sandbody type and the main exploration and development target of Bozhong C area in Bohai Bay. According to the late-stage accumulation theory， combined with the characteristics of petroleum distribution revealed by the prospecting and development wells， the petroleum enrichment regulation of distributary channel sandbody was statistically discussed， and the potentials of developed and undeveloped distributary channel sandbodies were quantitatively analyzed in order to provide the basis for the practice of rolling development. The results show that the horizontal oil-bearing distributary channel sandbody mainly distributes in the area within 5 km of primary faults in Bozhong C area on the plane， and the longitudinal oil-bearing distributary channel sandbody mainly concentrates in the altitude of -1 780--1 650 m； petroleum enrichment of distributary channel sandbody is horizontally controlled by the tectonic background and fault-sand contact relationship， and the petroleum is relatively enriched in the trap with large area and the distributary channel sandbody contacting with fault at high angle； petroleum enrichment is vertically controlled by the difference of base level cycle and the size of distributary channel sandbodies， and the distributary channel sandbodies in the single block with less than 5 km2 have high area filling rate in the middle-late stage of the rise of base level semi-cycle. Practice proves that the results make a better guidance to the rolling development， and are helpful to the efficient development and evaluation in this area， and have reference for the exploration and rolling development practice of similar blocks in Bohai Bay.

Key words： petroleum distribution； distributary channel sandbody； shallow water delta； Minghuazhen Formation； enrichment regulation； well deployment； potential evaluation； Bohai Bay