为填补玛西斜坡白碱滩组在沉积学方面的空白,综合运用岩心、测井及分析化验等资料,对白碱滩组三段的沉积相进行了研究。结果表明:目的层属于辫状河三角洲相,共识别出辫状河三角洲前缘和前三角洲2个亚相,以及水下分流河道、支流间湾、河口砂坝、远砂坝及前三角洲泥等5个微相;在浅水沉积背景下,研究区内发育了来自西北和东北2个物源方向的辫状河三角洲前缘朵体,该前缘朵体自底部T3b34小层到顶部T3b31小层沉积时期,持续向湖盆中心方向不断进积;在T3b32和T3b31小层沉积时期,水下分流河道和河口砂坝砂体在研究区内大面积分布,由于其具有良好的内在储集物性条件和外在的构造圈闭与油气充注条件,可作为研究区后续油气勘探的首要目标。研究成果可为研究区白碱滩组未来的油气勘探提供有力的理论支撑。
In order to fill the gap in sedimentology of Baijiantan Formation in the western slope area of Mahu Sag, the sedimentary facies of Member 3 of Baijiantan Formation were studied with core, logging, and analytical and test data. The results showed that the target layer was of the braided river delta facies, two subfacies (delta front and prodelta) and five microfacies (underwater distributary channel, inter-tributary bays, channel mouth bar, distal bar, and prodelta mud) were identified; under the background of shallow-water deposit, there were braided river delta-front lobes developed in two provenance directions in northwest and northeast in the study area; during the period of deposition from T3b34 sublayer at the bottom to T3b31 sublayer at the top, the front lobe continued to accumulate towards the center of the lake basin; during the deposition period of T3b32 and T3b31 sublayers, underwater distributary channel and underwater distributary channel were widely distributed in the study area and could be used as the primary targets for subsequent oil and gas exploration in the study area due to their excellent internal storage reservoir physical properties and external structural traps and hydrocarbon charging conditions. The study results can provide strong theoretical support for future oil and gas exploration of Baijiantan Formation in the study area.
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