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伊陕斜坡作为鄂尔多斯盆地的主体部分,油气资源丰富,其中的主要生油层为中生界上三叠统延长组长7油层组.区域上,长7油层组的界定长期以张家滩页岩(K1)作为重要标志.而在靖边油区的某些地区,由于区域性标志的缺失,长7油层组的界定成为难点.以靖边油区测井曲线为基础,根据基准面旋回与测井相特征来界定长7油层组,即长7油层组发育于中期旋回的基准面较高处,为滨浅湖-三角洲环境.该方法划分的长7油层组,便于研究区域内等时沉积地层的发育,能够更好地与区域地质相联系,尤其与盆地沉积环境演化特征相匹配.
As the main part of Erdos Basin, Yi-Shan slope is rich in oil and gas resources, and the main oil-producing layer in this area is Chang 7 oil layer of Upper Triassic Yanchang Formation in Mesozoic.Regionally, the definition of Chang-7 reservoir has long been dominated by Zhangjiadan shale (K1) is an important symbol, while in some areas of the Jingbian Oilfield, the definition of Chang-7 reservoir group becomes a difficult point due to the lack of regional symbols.Based on the well logging curves in Jingbian area, Well logging facies to define the Chang 7 reservoir, ie, the Chang 7 reservoir is developed at the upper part of the mid-term cycle datum and is a shallow lake-delta environment. The Chang 7 reservoir divided by this method is convenient for isochron The development of sedimentary strata can be better linked with the regional geology, especially with the sedimentary environment evolution characteristics of the basin.