南华北地区上古生界油气勘探方向及目标区研究

Research on the Upper Paleozoic Hydrocarbon Exploration Direction and Target Area in southern North China

南华北地区晚古生代与鄂尔多斯盆地为同一大型克拉通坳陷,发育有一套海陆交互相含煤地层,但南华北地区上古生界油气勘探至今尚未取得突破。通过开展南华北地区与鄂尔多斯盆地上古生界的石油地质条件类比研究,明确了制约南华北地区上古生界油气勘探突破的关键因素是后期的构造改造,在构造稳定区开展致密砂岩油气藏勘探是下步方向。研究结果表明:洛伊地区上古生界残存完整、厚度大,热演化程度适中,上覆直接盖层三叠系,且处于构造相对稳定区,有利于油气保存;区内已钻探井也于上古生界见良好气显示,综合评价为下步勘探的首选目标区,从而为南华北地区上古生界油气勘探突破指明了方向和目标。

In the late Paleozoic, the southern North China area and Ordos basin were in the same large cratonic de- pression, and developed a set of alternate marine-continental coal-bearing strata~ but the upper Paleozoic hydro- carbon exploration in southern North China has not yet achieved a breakthrough. Through the analogical research on upper Paleozoic petroleum geologic condition of the southern North China area and Ordos basin, the key factor that restricts the hydrocarbon exploration breakthrough of upper Paleozoic in the southern North China area is defined as the later structural reformation, and the tight sandstone hydrocarbon reservoir exploration in tectonic stable zone will be the next direction of future work. The results show that ： the upper Paleozoic residual strata in Lloyd is complete, with large thickness and moderate thermal evolution degree, overlain by the Triassic strata as its direct seal. It is in a relatively stable tectonic region, and is conducive to the preservation of oil and gas. The upper Paleozoic in the work area has good gas show in the drilled wells, and has been comprehensively evaluated for the preferred target for further exploration, which point out the Upper Paleozoic hydrocarbon exploration direction and target in the southern North China area.