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马岭油田延长组长8油层组是鄂尔多斯盆地老区未来油气勘探和开发的重要补充层系之一。研究资料表明,马岭油田长8油层组油藏的储层属于砂岩型储层,总体上物性较差,属低渗—超低渗储层;储层的分布范围较广,主要位于水下分流河道主干河道部位;成岩作用过程中溶蚀作用对于储层储集性能的改善作用明显。长8油层组上部油藏主要分布于水下分流河道的主河道位置或主河道侧翼位置,具有河道砂岩比较发育、相对较好的物性特征。同时,油藏饱和度与次生溶蚀孔隙的发育具有正相关性。说明马岭地区长8油层组油藏的形成与储层分布和储层发育特征关系密切。同时,三角洲前缘水下分流河道砂体距离油源近,两侧泥岩比较发育,具有形成油藏的有利圈闭等特征,是油气聚集的最有利相带。
Chang 8 reservoir in Yanchang Formation of Maling Oilfield is one of the important complementary strata of future oil and gas exploration and development in the old Ordos Basin. According to the research data, reservoirs in the Chang 8 reservoir of the Maling Oilfield are sandstone-type reservoirs, which are generally poor in physical properties and belong to the low permeability and ultra-low permeability reservoirs. The reservoirs are distributed in a wide range and are mainly located under water Diversion channel main channel parts; diagenesis during the dissolution of reservoir performance improvement obvious. The upper reservoirs of Chang 8 reservoir are mainly located in the main channel of the submarine distributary channel or the flanks of the main channel, which have relatively well developed and comparatively good physical characteristics of channel sandstone. At the same time, there is a positive correlation between reservoir saturation and the development of secondary dissolution pores. It shows that the reservoir formation of Chang 8 reservoir in Maling area is closely related to reservoir distribution and reservoir development. At the same time, the submarine distributary channel sand bodies in the delta front are close to the oil source, with relatively developed mudstone on both sides and favorable traps for formation of reservoirs, which are the most favorable facies belts for hydrocarbon accumulation.