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大港地区,早侏罗世进入地洼发展阶段。地洼活动早期(J_1),本区属正单位,沉积物不发育。中期(J_2—K)建造类型自下而上为火山岩建造。砂岩、砂-泥岩建造,砂、砾岩建造及泥岩建造,稳定性小,厚度变化率最大可达14.8％,生油岩不好。晚期(E—Q)的建造类型复杂,有五大类十七个亚类,多呈透镜状、短带状分布,分选性较差,分洗作用弱,稳定性较小,岩性,岩相变化快,厚度变化率常大于3％,沉积中心迁移频繁。生油岩有五套,总厚度大于1600米,有机碳含量为0.5—1.9％,储层物性较好,生储盖配置得当,埋藏深度常大于2000米,地温梯度较高,成油条件好。 上述特点的形成受本区地洼余动期地壳的冷缩—下沉—拉张及地壳活动不平衡的地壳运动所控制。 根据本区地洼余动期地壳运动、构造型相及沉积建造的特点,对北西向拉张型断裂控制的油藏、沉积中心迁移(前进式和往复式)产生的多层油藏和环状、放射状构造控制的油藏值得重视。
Dagang area, early Jurassic into depression stage of development. Di depression activity early (J_1), the area is a unit, the sediment is not developed. Medium-term (J_2-K) construction types are built from the bottom up for volcanic rocks. Sandstone, sand-mudstone construction, sand, conglomerate construction and mudstone construction, the stability is small, the maximum rate of change of thickness is up to 14.8%, and the source rock is not good. Late construction (E-Q) is a complex construction with seventeen subclasses in five major categories, mostly lenticular, short ribbons, poorly sorted, weakly segregated, less stable, lithologic, Rapid phase change, the thickness of the rate of change often more than 3%, frequent migration of sedimentary centers. There are five oil source rocks with a total thickness of more than 1,600 meters and an organic carbon content of 0.5-1.9%. The reservoir has better physical properties, proper reservoir and cover configuration, buried depth of more than 2,000 meters, high geothermal gradient and good oil formation conditions . The formation of the above characteristics is controlled by the crustal movement of the crustal shrinkage-sink-pull and crustal movement unbalance in the depression of the depression in this area. Based on the characteristics of crustal movement, tectonic facies and sedimentary construction during the period of depression in the area, the multi-layer reservoirs and rings (forward and reciprocating) migrated from reservoirs and sedimentary centers controlled by the extensional faults in northwestern China Shape and radial structure control of the reservoir deserves attention.