摘要
砂岩储集层中高岭石的发育程度与储集层物性和油气聚集关系密切。通过对渤南洼陷古近系沙三段和沙四段的岩心观察、薄片鉴定、扫描电镜、黏土矿物X-衍射、岩心物性和含油级别分析测试,研究深层碎屑岩中高岭石的发育特征及形成机理。深部碎屑岩储集层中的高岭石主要是由长石的溶蚀产生的,高岭石的发育是良好储集层和饱和油层出现的重要标志,高岭石含量出现相对高值的储集层与工业油层有很好的对应关系。研究区高岭石形成分为4个阶段:沉积高岭石向伊利石转化阶段、自生高岭石大量产生阶段、油层中的高岭石被油气包围阶段及油层中高岭石出现异常高值阶段。深部碎屑岩储集层中的高岭石形成于酸性流体和长石相互作用的酸性成岩场中,保存在油气充注形成的惰性成岩场中,在弱碱性成岩场中迅速向伊利石和绿泥石转化。
In sandstone reservoirs, the development degree of kaolinite is related to reservoir properties and accumulation of oil and gas. Through core observation, thin section analysis, SEM, X-ray of clay mineral, core properties and oil-level test in ES3 ＋ ES4 of Bonan sub-sag, we studied the development characteristics and formation mechanism of kaolinite in deep elastic rocks. Kaolinite in deep elastic reservoirs is generated by corrosion of feldspar, and the kaolinite development is an important mark of good reservoirs and oil-saturated layers. Reservoirs of high kaolinite content have a good relationship with industrial oil layers. The formation of kaolinite in the study area has four stages, transformation from depositional kaolinite to illite, production of a large amount of authigenic kaolinite, kaolinite in oil layer being surrounded by oil and gas, and kaolinite being particularly high. The kaolinite in deep elastic reservoirs was formed in an acidic diagenetic field where acidic fluid and feldspar interacted, was kept in an inert diagenetic field formed by oil and gas filling, and was quickly transformed into illite and chlorite in an alkalescent diagenetic field.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2009年第4期456-462,共7页
Petroleum Exploration and Development
基金
国家"十五"科技攻关项目(2001BA605A09)
关键词
古近系
高岭石
发育特征
转化机理
研究意义
渤南洼陷
Paleogene
kaolinite
development characteristics
transformation mechanism
research significance
Bonan s ubsag
