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南华北盆地是我国东部重要的油气远景区之一,历经多年勘探,但始终没有工业性突破。以地震和钻井等资料综合分析为基础,以上古生界油气为主要目的层,综合考虑太康隆起油气地质条件,重点考虑保存条件,同时参考烃源岩及储层条件,可将太康隆起西部地区重新划分为5个次级单元,即:北部斜坡带、中部鼻状构造带、尉氏—薛店南次凹带、通许凸起和新郑凸起。太康隆起西部上古生界残存分布面积广、厚度大,埋藏深度适中,三叠系残存较为完整,构造整体比较稳定,圈闭发育,具备早期生烃的保存和成藏条件。从中优选出庄头断鼻部署实施钻探,在上古生界发现气测异常69段,累计厚度为81.3m,气测异常全烃最大值为24.1%;测井综合解释致密气7层,累计厚度为41.6m,其中厚度超过7m的单层为4层;页岩气层9层,累计厚度为72.3m,其中最大单层厚度为28.4m,进一步展示了太康隆起西部新区天然气的勘探前景,对推进南华北地区海陆交互相天然气资源调查和评价具有重要意义。
South China North Basin is one of the important oil and gas prospect areas in eastern China. After many years of exploration, there has been no industrial breakthrough. Taking the comprehensive analysis of seismic and drilling data as the base and the upper Paleozoic hydrocarbon as the main target layer, considering the geologic conditions of Taicang uplift, considering the preservation conditions, taking into account the source rock and reservoir conditions, The western region is subdivided into five sub-units: the northern slope zone, the central nose zone, the Weishi-Xuedian south subducting zone, Tongxu convex and Xinzheng bulge. The Upper Paleozoic remnant of the Taihang Uplift has a large area, a large thickness, a moderate depth of burial, a relatively complete remnant of Triassic, a relatively stable structure and a well-developed trap with the conditions of early hydrocarbon generation and accumulation. In this study, a series of rigorous drilling techniques were selected to implement drilling. In the Upper Paleozoic, 69 abnormal gas measurements were found with an accumulated thickness of 81.3 m and a maximum of 24.1% of total hydrocarbon anomalies. Logging comprehensively explained 7 layers of tight gas with accumulated thickness Which is 41.6m. Among them, there are 4 monolayers with a thickness of more than 7m. The 9-layer shale gas with a total thickness of 72.3m, of which the maximum monolayer thickness is 28.4m, further demonstrates the exploration prospect of natural gas in the western part of the Taihang Uplift, It is of great significance to promote the investigation and evaluation of natural gas resources in the intercontinental and intercontinental phase in South China and North China.