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为了揭示准噶尔盆地石南地区清水河组沉积层序演化及油气藏分布规律,利用岩心、分析化验、古生物、钻测井及三维地震资料,重新厘定清水河组底界及层序地层结构.在此基础上,恢复沉积期古地貌,分析清水河组物源及沉积层序演化,探讨发育油气藏类型及其特征.研究结果表明:清水河组底界应以侏罗系风化杂色泥岩上部砂砾岩或砂岩底部为标志.清水河组为一完整的三级层序,并受控于北部盆外物源体系,其中清一段底部连片砂砾岩为低位沟谷辫状河沉积,湖侵早期发育辫状河三角洲砂岩沉积,而晚期滨浅湖-半深湖相泥岩覆盖全区,清二段则为高位域沉积.石南地区清水河组沉积期沟谷-残丘古地貌特征明显,残丘主体部位最高处距沟谷内最低处高差在110~120m之间,其中低位沟谷辫状河砂砾岩体沉积厚度最大可达60m.受控于沟谷残丘这一特殊的古地貌,石南地区共发育侏罗系古残丘型、清水河组低位超覆砂砾岩型、低位沟谷砂砾岩型及湖侵砂岩型4类油气藏,而这4类油气藏是下步油气勘探的有利目标.
In order to reveal the sedimentary sequence evolution and the distribution of oil and gas reservoirs in Qingshuihe Formation in Shinao area of Junggar Basin, the bottom boundary and sequence stratigraphic structure of Qingshuihe Formation are redefined by using core, analytical laboratory, paleontology, drilling and logging and 3D seismic data. On the basis of this, the paleogeomorphology of sedimentary period was restored and the source and sedimentary sequence evolution of Qingshuihe Formation were analyzed, and the types and characteristics of developmental reservoirs were discussed.The results show that the bottom boundary of Qingshuihe Formation should be the upper Jurassic variegated variegated mudstone Sandy conglomerate or sandstone.The Qingshuihe Formation is a complete third-order sequence and is controlled by the northern basin source system, in which the contiguous gritstone in the first stage of the Qing dynasty is a low-braided river sedimentary deposit and the early stage of the lake invasion Developed braided river delta sandstones, whereas the late shore-shallow lake-semi-deep lacustrine mudstone covers the whole area and the Qing 2 section is high-level sedimentary. The Qingshuihe Formation in the southern part of Qingshuihe Formation has obvious paleogeomorphic features of the valleys and remnant hills, The highest part of the main part of the valley from the lowest height difference between 110 ~ 120m, of which the low valley braided river sand conglomerate thickness of up to 60m. Controlled by the valleys of this special paleogeomorphology, Shimnam area Total Jurassic ancient fertility monadnock type, Qingshuihe low overlap conglomerate-type, low valley and lake transgression conglomerate-type sandstone reservoir type 4 class, and this class reservoir 4 is the next step favorable targets for hydrocarbon exploration.