渤海灣渤中C地區(qū)分流河道砂體油氣富集規(guī)律及滾動(dòng)開發(fā)實(shí)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(qū)最具含油潛力的砂體類型，也是該區(qū)后期滾動(dòng)挖潛的主要對(duì)象。以區(qū)域晚期成藏理論為指導(dǎo)，結(jié)合探井、開發(fā)井揭示的油氣分布特征，以統(tǒng)計(jì)學(xué)為手段，弄清分流河道砂體的油氣富集規(guī)律，對(duì)已開發(fā)或未開發(fā)分流河道砂體的潛力進(jìn)行定量化分析，為滾動(dòng)開發(fā)實(shí)踐提供依據(jù)。結(jié)果表明：該區(qū)含油分流河道砂體平面上主要分布在渤中C地區(qū)主控?cái)鄬悠矫婢嚯x5 km以內(nèi)的區(qū)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(gòu)造背景和斷砂的接觸關(guān)系，位于面積大的圈閉內(nèi)并與斷層高角度接觸的分流河道砂體油氣相對(duì)富集，縱向上受控于各層位基準(zhǔn)面旋回差異及分流河道砂體規(guī)模的大小，發(fā)育于基準(zhǔn)面上升半旋回中晚期且在單一區(qū)塊內(nèi)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(shí)踐證實(shí)，該成果較好指導(dǎo)了該區(qū)的滾動(dòng)開發(fā)實(shí)踐，有助于油田的高效開發(fā)評(píng)價(jià)，對(duì)類似區(qū)塊的勘探及滾動(dòng)開發(fā)評(píng)價(jià)具有重要的指導(dǎo)意義。

關(guān)鍵詞：油氣分布；分流河道砂體；淺水三角洲；明化鎮(zhèn)組；富集規(guī)律；井位部署；潛力評(píng)價(jià)；渤海灣

中圖分類號(hào)：P618.13；TE122 文獻(xiàn)標(biāo)志碼：A

文章編號(hào)：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