高邮凹陷深层系有效储层形成控制因素

doi:10.11743/ogg20150510

摘要/Abstract

摘要： 高邮凹陷发育上、中、下三套含油气系统，深层系油藏属于下含油气系统。通过对深层系成藏基本特征及有效储层发育关键控制因素的研究，取得系统认识。下含油气系统成藏条件表现为“上生下储”特点，即上部阜宁组二段生成的油气，在异常高压条件下下排进入阜宁组一段储层。阜一段储层主要为三角洲前缘亚相沉积，砂体发育，但整体表现为低孔、低渗特点。研究认为，沉积微相、埋深与成岩、异常高压与油气充注三者控制了深层有效储层的发育；水下分流河道和河口坝是有效储层发育的有利微相；储层处于晚成岩A1期，次生孔隙发育改善了储集条件；深层系存在异常高压层有利于油气充注，油气充注时间早于砂岩致密化时间，有利于储集空间保存。其中，有利的沉积微相和发育次生孔隙带是决定深层发育有效储层的主要因素。

关键词: 次生孔隙, 有效储层, 深层系, 高邮凹陷

Abstract: There developed three petroleum systems in the Gaoyou Sag,Subei Basin,including the upper,the middle and the lower petroleum system.The deep reservoirs belong to the lower petroleum system.The basic characteristics of hydrocarbon accumulation and the key factors controlling the formation of deep reservoirs are studied.Hydrocarbon accumulation in the lower petroleum system features in “upper source rock-lower reservoir”.That is,hydrocarbons sourced from the upper E₁f² migrated downward into the E₁f¹ under abnormal high pressure.The E₁f¹ reservoirs are mainly delta front sands with large volume but low porosity and low permeability.The result shows that development of the deep effective reservoir was controlled by sedimentary microfacies,burial depth and diagenesis as well as abnormal pressure and hydrocarbon charging.Underwater distributary channel and mouth bar are favorable sedimentary microfacies for effective reservoirs;The reservoirs are in the late diagenetic stage A1 and the secondary pores improved reservoir quality;The abnormal high pressure in the deep reservoirs is favorable for hydrocarbon charging,and the charging is earlier than sandstone densification,being conducive to reservoir space preservation.Among these factors,the favorable sedimentary microfacies and the development of secondary pore zone are the main factors controlling the development of deep effective reservoirs.

Key words: secondary pore, effective reservoir, deep layer series, Gaoyou Sag

中图分类号:

TE122.2

秦伟军,李娜,付兆辉. 高邮凹陷深层系有效储层形成控制因素[J]. 石油与天然气地质, 2015, 36(5): 788-792. doi: 10.11743/ogg20150510 Qin Weijun,Li Na,Fu Zhaohui. Factors controlling formation of effective reservoirs in deep of the Gaoyou Sag[J]. Oil & Gas Geology, 2015, 36(5): 788-792. doi: 10.11743/ogg20150510

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