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江汉盆地潜江凹陷建新地区新生界地层自上而下依次第四系平原组,上第三系广华寺组,下第三系荆河镇组、潜江组、荆沙组、新沟嘴组、沙市组。主要目的层新沟嘴组岩性为棕紫色、棕红色、灰色泥岩与石膏质泥岩呈不等厚互层间夹灰色粉砂岩。在对建新地区地层层序和构造特征进行分析研究的基础上,利用地质、气测、测井、试油等多项井筒技术资料综合分析了该地区的生储盖组合及油气显示,提出建新地区新沟嘴组下段Ⅰ、Ⅱ、Ⅲ油组均可发育有含油圈闭,油质以轻质油为主。
The Cenozoic strata in Jianxin area of Qianjiang Sag in Jianghan Basin are composed of Quaternary plain group, Guanghuasiji Formation, Jinghezhen Formation of Lower Tertiary, Qianjiang Formation, Jingsha Formation, Xin Gouzui Group, Shashi group. The main purpose of the Xingouigouzui Formation is lithic purple and reddish brown. The gray mudstone and the gypsum mudstone are interbedded with gray siltstone with unequal thickness. Based on the analysis of stratigraphic sequence and tectonic features in the new area, the authors use the data of multiple wellbores such as geology, gas detection, well logging and oil testing to comprehensively analyze the reservoir-cap assemblage and oil-gas display in this area, In the lower part of the Xingouzui Formation, oil-bearing traps can develop in oil fields of Group I, II and III, with light oil as the main oil.