塔东地区寒武系储层沉积相特征研究

The Characteristics of Sedimentary Facies in the Cambrian Reservoirs of Tadong Area

寒武系白云岩具有形成优质储集层的条件,是潜在的油气勘探领域。以塔东隆起带(古城低凸起-塔东隆起-罗布泊凸起)为重点区域,在精细构造解释的基础上,充分利用已有钻、测井及岩心等资料,结合周边露头区,对塔东地区寒武系储层沉积研究,结果表明,古城台地和罗西台地坡折较明显,属于镶边碳酸盐陆棚边缘模式中水动力较强的边缘陡崖型坡折,在地震剖面上可识别出寒武系一系列边缘浅滩地震相垂向加积、进积叠合特征;坡折带控制了台缘滩相有利储层带,坡折之上是台地相及台缘高能礁、礁-滩复合体发育的有利部位,坡折之下为深海盆地区。

Oil and gas exploration and research level are low in Tadong Area,especially in the deep basin area of carbonate reservoir.Cambrian dolomite has the conditions for forming high quality reservoirs,it is the potential area for oil and gas exploration.In the study,Tadong uplift belt(Gucheng low upliftTadong uplift-uplift)is used as the key region for study,based on the fine structural interpretation,full use of the existing drilling,logging and core data and combined with the circumferential outcrop areas,the sediments in the Cambrian reservoirs are studied.The result shows that the break of Gucheng Platform and the platform in the western Lop Nor Platform is obvious,it belongs to a break with marginal escarpment with strong hydropower in the rimmed carbonate shelf margin,sectionally a series of vertical accretion marginal shallow beaches and progradational superposition,where beneficial reservoirs in the margin of the platform are controlled by the break belt,over it,there is the beneficial area for growing the platform,reef-beach combinations,below it there is a deep marine basin area.