石油实验地质Issue(4)：450-458,9.DOI:10.11781/sysydz201404450
费尔干纳盆地超深层油气成藏系统
Ultra-deep petroleum accumulation systems in Fergana Basin
徐洪 1杨玉峰1
作者信息
- 1. 中国石油 天然气勘探开发公司，北京 100034
- 折叠
摘要
Abstract
In the central graben zone of the Fergana Basin, overpressures were widespread during Cenozoic, which might be related to tectonic compression environment, disequilibrium compaction caused by quick sedi-mentation and continuous hydrocarbon generation. The ultra-high pressure environment had important effects on deep oil and gas generation, migration and accumulation. The main reservoirs were buried over 5 000 m deep in Neogene, and mainly gave birth to liquid hydrocarbons. The high-porosity and high-permeability sandstone reser-voirs in deep formations came from fluvial sandstones under ultra-high pressure, and were featured by low coring recovery rate and high sand production. The low-porosity and high-permeability reservoirs were related to hydrau-lic fractures caused by high pressure. In the carbonate reservoirs in Paleogene, H2S was in high content, mainly generating from thermochemical sulfate reduction ( TSR) , which obviously improved the physical property of gyp-sum carbonate reservoirs. The formation pressure coefficient was slightly lower than that of Neogene, which could be explained by heavy hydrocarbon gas loss and reservoir space increase. The main petroleum systems in the cen-tral graben zone can be divided into the upper E-E3 N system and the lower JK-E1-2 system. High-production reservoirs of the upper E-E3N petroleum system are controlled by channel sandstones and overpressure, while those of the lower JK-E1-2 petroleum system are mainly affected by the gypsum-containing carbonate reservoirs of lagoon facies. The two systems are totally different in pressure and fluid properties, hence are suitable for slicing production.关键词
异常高压/深层/油气成藏系统/费尔干纳盆地Key words
abnormal high pressure/deep formation/petroleum accumulation system/Fergana Basin分类
能源科技引用本文复制引用
徐洪,杨玉峰..费尔干纳盆地超深层油气成藏系统[J].石油实验地质,2014,(4):450-458,9.
