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分析了鄂尔多斯盆地周湾—长城地区延长组长8、长6油层组油藏类型及特征,从烃源岩、沉积相带、水下分流河道砂体、导运系统、成藏期与构造期的耦合关系这五个方面对长8、长6段油藏成藏进行了探讨。结果表明:周湾—长城地区延长组长8、长6段油藏类型主要为构造—岩性油藏,油层层数多、油层厚度薄是研究区油藏分布的总体特征;长8、长6油层组的北东向水下分流河道砂体发育与其研究区西南井区“张家滩”烃源岩分布区,在空间上构成较好的生储配置,且油藏的形成主要受砂体纵向叠置与横向连片、裂隙两大导运系统控制,这些奠定了研究区长8、长6油藏形成的地质基础。通过包裹体均一温度测定与埋藏成藏史分析成果表明,研究区成藏时间应为早白垩世早期至早白垩世中期,此时研究区位于长7生烃坳陷东北古构造较高的位置,无疑是油气运移的指向,为研究区长8、长6油藏形成提供了有利条件。
The types and characteristics of reservoirs in Chang 8 and Chang 6 reservoirs of Yanchang Formation in the Zhouwan-Changcheng area of Ordos Basin are analyzed. From the source rocks, sedimentary facies belts, submarine distributary channel sand bodies, the transport system, the period of hydrocarbon accumulation and tectonic period Of the coupling relationship between the five aspects of the Chang 8, Chang 6 reservoir formation were discussed. The results show that the reservoirs in Chang 8 and Chang 6 of the Yanchang Formation in the Zhouwan-Changcheng area are mainly tectonic-lithologic reservoirs with a large number of oil layers and a thin reservoir layer. The reservoir characteristics are generally 8, 6 North Eastern subaqueous distributary channel sandstone development in the oil-bearing formation and its distribution area in the study area “Zhangjiatan” source rock make a relatively good reservoir configuration spatially and the reservoir formation is mainly It is controlled by two large-scale transport systems such as vertical superimposition of sand bodies and horizontal contiguous and fissures, which have laid the geological foundation for the study of the Chang 8 and Chang 6 reservoirs. The result of homogenization temperature measurement and burial history shows that the accumulation time of the study area should be from Early Cretaceous to mid-early Cretaceous. At this time, the study area is located in the northeastern part of the Changbei 7 hydrocarbon generation depression Is undoubtedly the source of hydrocarbon migration, which provides favorable conditions for the study of the formation of Wulian 8 and Chang 6 reservoirs.