费尔干纳盆地超深层油气成藏系统.docx

Vol.36,No.4 Jul.,2014第36卷第4期 2014年7月石 油 实 验 Vol.36,No.4 Jul.,2014 第36卷第4期 2014年7月 PETROLEUM GEOLOGY EXPERIMENT 文章编号：1001-6112(2014)04-0450-09 doi:10. 11781/sysydz201404450 费尔干纳盆地超深层油气成藏系统 徐 洪，杨玉峰 (中国石油天然气勘探开发公司，北京 100034) 摘要：费尔干纳盆地中央地堑带新生界中普遍发育超高压异常，其与构造挤压环境、快速沉降不均衡压实以及持续的生烃作用有关。 这种超高压环境对深层油气的生成、聚集成藏产生了重要的影响。主要目的层新近系埋深超过5000m,仍以液态烃产出，深层高孔 高渗类砂岩储层是河道砂岩在超高压环境下未经正常压实形成的，表现为取心收获率低、生产过程中易出砂的特征；而低孔高渗类 储层与高压形成的水力破裂裂缝有关。古近系碳酸盐岩储层中高含硫化氢气体来源于TSR 反应，TSR 作用使含石膏碳酸盐岩储层 物性得到了显著的改善，其油层组压力系数稍低于新近系油层组是重烃类气体损耗、储集空间增大两方面因素叠加的结果。中央地 堑带主要目的层成藏系统划分为上部E-E?N 系统和下部JK-E?-2 系统；上部高产储层主要受河道砂岩和超高压控制，下部高产层主 要受鴻湖相的含石膏碳酸盐岩储层控制，2个含油气系统的压力、流体性质均有较大的差别，适宜于分层开采。 关键词：异常高压；深层；油气成藏系统；费尔干纳盆地 中图分类号：TE122.3 文献标识码：A Ultra-deep petroleum accumulation systems in Fergana Basin Xu Hong,Yang Yufeng (China National Oil-Gas Exploration Development Corporation,Beijing 100034,China) Abstract: In the central graben zone of the Fergana Basin, overpressures were widespread during Cenoroic, 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 5000 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,H?S was in high content, mainly generating from thermo