论文部分内容阅读
通过油源对比确定了鄂尔多斯盆地陇东地区延长组长4+5、长6、长9暗色泥岩和长7油页岩与暗色泥岩的有效性,进一步采用热解烃指数(HCI)、可溶有机质与有机碳含量关系确定了有效烃源岩的有机碳含量下限为1.1%。以此下限值作为标准,与单井测井资料预测的有机碳含量值结合,确定了单井不同层段有效烃源岩的厚度。通过大量钻井有效烃源岩的厚度统计,确定了不同层段有效烃源岩的厚度分布特征。长4+5有效烃源岩主要分布在研究区中部,最大厚度超过60m。长6有效烃源岩的分布中心集中在庆城—马岭一带,最大厚度超过70m,沉积中心的厚度在20～70m,分布范围与长7油页岩的分布较为一致。长9有效烃源岩在东北部的志丹地区,主体厚度在30～60m。
Through the comparison of oil sources, the validity of Chang 4 + 5, Chang 6, Chang 9 dark mudstone and Chang 7 oil shale and dark mudstone of Yanchang Formation in Longdong area, Ordos Basin, is confirmed. The pyrolysis hydrocarbon index (HCI) The relationship between organic matter and organic carbon content determines that the lower limit of organic carbon content in effective source rocks is 1.1%. Taking this lower limit value as the standard, combined with the predicted organic carbon content of single well log data, the effective source rock thickness of different layers in single well was determined. Through the statistics of the thickness of a large number of effective drilling source rock, the thickness distribution of effective source rocks in different layers is determined. The effective 4 + 5 source rocks are mainly distributed in the central part of the study area and the maximum thickness exceeds 60m. The distribution center of Chang 6 effective hydrocarbon source rock is concentrated in the Qingcheng-Maling area with a maximum thickness of more than 70m and a sedimentary center thickness of 20-70m. The distribution range is consistent with that of Chang 7 oil shale. Chang 9 effective source rock in the Zhidan area in the northeast, the main thickness of 30 ~ 60m.