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针对砂岩、砾岩岩性油气藏发育和分布规律这一难题,以东营凹陷永安镇油田沙三段“槽谷”砂体为例,对“槽谷”砂体进行了研究。“槽谷”砂体是主要以扇三角洲前缘砂体为主的1套在断陷湖盆陡坡带发育的一种砂体。在地震剖面上,砂体在横向上超覆尖灭在下伏沉积物之上,电性特征明显,SP曲线上砂体由下而上为齿化漏斗形、多个高幅齿化箱形、齿化箱形与齿化钟形。“槽谷”砂体储层不管在横向上还是在纵向上都有较大的变化:纵向上,砂体的厚度变化大;横向上,砂体的连续性很差。其成因为沉积物向盆地充填过程中,遇到北西西向延伸的断槽,沿着这些断槽向西进入湖盆,并在断槽内形成扇三角洲前缘沉积。
In view of the problem of the development and distribution of sandstone and conglomerate lithologic reservoirs, the “trough ” sand body in the “Sand Valley” sand body of Yongan Oilfield in Dongying Sag as an example was studied. The “Trough Valley” sand body is a sand body mainly composed of fan delta front sand bodies, developed in the steep slope of the fault depression lake basin. In the seismic section, the sand body overturns in the horizontal direction and plunges over the underlying sediments. The electrical characteristics are obvious. The sand body on the SP curve is a toothed funnel shape from bottom to top, Gear box shape and tooth bell. The reservoir of “trough valley” has great changes both horizontally and longitudinally: the thickness of sand body varies greatly along the vertical direction, and the continuity of the sand body is poor laterally. The reason is that sediments infiltrated into the basin encounter the northwest-westward extension of the fault, along the fault to the west into the lake basin, and in the fault to form the fan delta front deposition.