济阳坳陷古近系轻质原油油藏勘探潜力与方向

随着深层勘探工作推进,济阳坳陷古近系深层发现了以凝析油气为主的轻质原油油藏,展示了深层巨大的勘探潜力.通过对轻质原油油藏油气来源、储集空间、成藏过程解剖,明确了济阳坳陷轻质原油油藏勘探潜力.研究结果表明,济阳坳陷轻质原油油藏具有低密度、低黏度、低凝固点、高气油比的特征,原油呈黄色—无色,油藏一般呈埋深大、地层压力大、单...

Exploration potential and direction of Palaeogene light crude oil reservoirs in Jiyang depression

Through deep exploration, light crude oil reservoirs dominated by condensate oil and gas have been discovered in the deep paleogene formation of Jiyang depression, indicating the huge exploration potential in deep reservoirs. The potential of light crude oil reservoirs in Jiyang depression is determined by analyzing the oil and gas source, reservoir space and reservoir-forming process of light crude oil reservoirs. The results suggest that the light crude oil reservoirs in Jiyang depression are characterized by low density, low viscosity, low freezing point and high gas-oil ratio, the crude oil is yellow or colorless, and the oil reservoirs are usually characterized by large buried depth, high stratum pressure and high sigle-well deliverability. A comprehensive analysis confirms that the light crude oil mainly originates from highly mature source rock in deep lower member of Es₄^x and Ek, which has a relatively strong resource base. The effective reservoir development model under the co-control of acid and base in deep stratum has broken through the understanding that the effective porosity is underdeveloped at the high ground temperature in deep stratum, proving that high-quality reservoirs are still developed at the depth below 4 km, which enhances the value of deep exploration. By analyzing the reservoir-forming process of light crude oil reservoirs, this paper puts forward two reservoiring models based on self source and other sources in deep stratum, pointing out the exploration direction of light crude oil reservoirs. Moreover, the comprehensive research has determined the exploration direction of light crude oil reservoirs such as sandstone rock in steep slope belt, deep red-bed reservoir body in gentle slope belt, low buried hill in slope belt and highly evolved shale oil in depression belt, providing a scientific basis for deep exploration in Jiyang depression.