准噶尔盆地北三台地区清水河组低渗透储层成因机制

doi:10.7623/syxb201205004

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摘要

碎屑岩低渗透储层成因机制包括低渗透储层物性主控因素和储层致密史-油藏成藏史匹配关系两个方面。综合利用岩心观察、薄片鉴定、图像分析、扫描电镜观察、压汞与岩石物性测试等多种技术方法，对准噶尔盆地北三台地区下白垩统清水河组低渗透储层进行了研究。储层低渗透特征具有沉积作用主控、压实作用主导、溶蚀作用改善、胶结作用强化的特点。针对砂质砾岩—细砾岩、细砂岩、粉砂岩和泥质粉砂岩，以“储层成岩作用演化序列-储层孔隙结构”为约束进行地质历史时期储层物性的恢复，确定不同区带、不同岩性储层的低渗透形成时间，结合油藏成藏史及原油分布特征，分析清水河组低渗透储层成因机制。清水河组存在3类不同成因类型的储层，Ⅰ类为中渗成藏现今中渗储层、Ⅱ类为中渗成藏-现今（特）低渗储层、Ⅲ类为（特/超）低渗成藏现今（特/超）低渗储层；其中Ⅱ类细分出2个亚类，Ⅲ类细分出4个亚类。针对不同成因类型的（低渗透）储层，结合成藏时期储层渗透率特征、储层含油级别、原油特征及试油试采成果等，进行了钻前勘探潜力分析及有效开发增产措施的优选。

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	操应长　远光辉　王艳忠　葸克来　匡立春　王绪龙　贾希玉　宋　永

关键词 ：准噶尔盆地, 低渗透储层, 成因机制, 主控因素, 致密史-成藏史

Abstract：

Genetic mechanisms of low-permeability clastic reservoirs include many controlling factors, such as low-permeability reservoir properties and a matching relationship between the reservoir compaction history and the hydrocarbon accumulation history. Currently, studies on the controlling factors of low-permeability reservoir properties have been relatively mature, while the matching relationship between the reservoir compaction history and the hydrocarbon accumulation history has been less studied. Therefore, we studied the Lower Cretaceous Qingshuihe Formation low-permeability reservoirs of the Beisantai area, Junggar Basin by means of core observation, thin section identification, image analysis, scanning electron microscopy observation, mercury penetration, petrophysical property testing and other technical methods. The result showed that the low-permeability reservoirs are characterized of being controlled by deposition, predominated by compaction, improved by dissolution and enhanced by cementation. Confined by “reservoir diagenesis evolutionary sequence and reservoir pore structure” conditions, physical properties of sandy-fine conglomerate, fine sandstone, siltstone and argillaceous siltstone reservoirs in geological history were restored, respectively, and the geological time when reservoirs with different lithology in different zones form low-permeability properties was determined based on the reservoir property evolutionary history. Genetic mechanisms of the Qingshuihe Formation low-permeability reservoirs were investigated in combination with the reservoir property evolutionary history, hydrocarbon accumulation history and distribution features of crude oils. The results showed that there exist three different genetic types of reservoirs in the Qingshuihe Formation. Type Ⅰ had medium permeability in the hydrocarbon accumulation period and remains in this permeability now. Type Ⅱ had medium permeability in the hydrocarbon accumulation period and shows low (extra- or super-low) permeability now. Type Ⅲ had low (extra- or super-low) permeability in the hydrocarbon accumulation period and remains in the permeability now. Moreover, type Ⅱ can be subdivided into two sub-types and type Ⅲ into four sub-types. Integrated with reservoir physical properties in the hydrocarbon accumulation period, oil-bearing grades of reservoirs, characteristics of crude oils and oil testing results, we analyzed the exploration potential of different genetic types of reservoirs before drilling, and optimized effective development and stimulation methods.

Key words： Junggar Basin low-permeability reservoir genetic mechanism main controlling factor compaction history-accumulation history

收稿日期: 2012-02-14 出版日期: 2012-09-25

基金资助:

国家自然科学基金项目（No.40972080）、国家重大科技专项（2011ZX05009）、中国石油大学（华东）研究生自主创新科研计划项目（12CX06003A）资助。

通讯作者: 操应长 E-mail: cyc8391680@163.com

作者简介: 操应长，男，1969年1月生，1992年获石油大学（华东）沉积地质专业学士学位，2003年获中国科学院地质学博士学位，现为中国石油大学（华东）教授、博士生导师，主要从事沉积学、层序地层学及油气储层地质学的教学和科研工作。

引用本文:

操应长　远光辉　王艳忠　葸克来　匡立春　王绪龙　贾希玉　宋　永. 准噶尔盆地北三台地区清水河组低渗透储层成因机制[J]. 石油学报, 2012, 33(5): 758-771.
CAO Yingchang　YUAN Guanghui　WANG Yanzhong　XI Kelai　KUANG Lichun. Genetic mechanisms of low permeability reservoirs of Qingshuihe Formation in Beisantai area, Junggar Basin[J]. Acta Petrolei Sinica, 2012, 33(5): 758-771.

链接本文:

http://www.syxb-cps.com.cn/CN/10.7623/syxb201205004 或 http://www.syxb-cps.com.cn/CN/Y2012/V33/I5/758

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