论文部分内容阅读
渤海湾盆地济阳坳陷浅层天然气蕴藏丰富，目前已探明的储量占全盆地浅层气总储量的９０％以上，因此研究其成藏条件及分布规律具有重要意义。本着这一目的，通过研究得出如下主要认识：（１）晚第三纪构造活动微弱，断层极少，气候干、寒，沉积层中泥质岩发育，富含蒙脱石等膨胀性粘土矿物，对浅层气的保存十分有利；（２）据成岩作用及气藏资料分析，浅气藏一般形成在８００ｍ深度以下；（３）根据地质特征及气藏分布状况，在坳陷内建立了凸起带、断裂带和斜坡带的３种成藏模式；（４）浅层气在纵向上富集于上第三系泛滥平原亚相沉积中，常与稠油共生，形成“下油、上气”的格局；（５）浅气藏在平面上主要分布于凹间隆起和断裂带上，斜坡带气藏规模较小，凹陷中常围绕凹陷成环带状分布。根据天然气地质条件综合分析、对比认为，济阳坳陷浅层气勘探应以东营、粘化凹陷为重点。
The shallow natural gas in the Jiyang Depression in the Bohai Bay Basin is abundant. At present, the proven reserves account for more than 90% of the total reserves of shallow gas in the whole basin. Therefore, it is of great significance to study the hydrocarbon accumulation conditions and distribution laws. In this regard, the following main findings are obtained through the research: (1) Late Tertiary tectonic activity was weak with very few faults, and the muddy rocks in the dry, cold and sedimentary layers of the climate developed and were rich in swelling properties such as montmorillonite (2) According to the analysis of diagenesis and gas reservoir data, the shallow gas reservoirs generally form below 800m depth; (3) According to the geologic characteristics and gas reservoir distribution, they are within the depression (3) Three kinds of hydrocarbon accumulation models of uplift zone, fault zone and slope zone have been established. (4) Shallow gas is enriched in the subfacies of the Upper Triassic flood plain in the vertical direction, Oil and gas "pattern. (5) The shallow gas reservoirs are mainly distributed in the concave uplift and fault zone in the plane. The gas reservoirs in the slope zone are small in size and the sags are often distributed around the depression into a ring-shaped zone. Based on the comprehensive analysis of natural gas geologic conditions, it is comparatively considered that shallow gas exploration in Jiyang Depression should focus on Dongying and viscous depression.