石油与天然气地质 ›› 2010, Vol. 31 ›› Issue (5): 656-663.doi: 10.11743/ogg20100515

• 石油与天然气地质 • 上一篇    下一篇

济阳坳陷古近系深层自生矿物及其与孔隙发育的关系

  

  1. 中国科学院研究生院，北京100049
  • 出版日期:2010-10-28 发布日期:2010-12-10
  • 第一作者简介:马国刚（1967—），男，副研究员，石油地质。
  • 基金项目:

    国家科技重大专项（2009ZX05009-002）;山东省自然科学基金项目（2009ZRA05059）。

Relationship between authigenic m inerals and porosity in the deep Paleogene form ations of the Jiyang Depression

  • Online:2010-10-28 Published:2010-12-10

PDF (PC)

487

被引次数

4

摘要：

通过岩石薄片鉴定、粘土矿物X-衍射分析、镜质体反射率和油层物性分析等手段，结合区域油气地质研究成果，对济阳坳陷古近系沙河街组三段—四段深部碎屑岩储层自生矿物演化特征与次生孔隙发育带的关系进行了研究。结果表明，沙三段深部储层埋深3150～3600m处次生孔隙主要与碳酸盐类等酸溶性组分的溶蚀有关，埋深4250～4500m处的次生孔隙主要成因于碱性溶蚀作用。沙四段次生孔隙发育带（埋深3350～3600，3950～4200和4500～4900m）主要与还原条件下酸溶性矿物的溶蚀有关;埋深5600～5700m处次生孔隙的发育主要与碱溶性组分的溶蚀有关。车镇凹陷埋深4400～4700m处的高岭石低值带、伊利石含量高值带与次生孔隙发育带对应。东营凹陷北带和渤南洼陷深层绿泥石高值带与孔隙带发育有较好的一致性，且与伊利石含量呈消长关系。渤南洼陷在埋深3500～4800m处存在明显的粘土矿物转化异常带，且伊/蒙混层比高值带与绿泥石激增带及次生孔隙带具有较好的一致性。

关键词: 自生矿物, 孔隙, 深层, 沙河街组, 古近系, 济阳坳陷

Abstract:

Measures as thinˉsection analysis，claym ineral X-ray diffraction，vitrinite reflection and physical proˉperty analysis of oil layer，combined with the results of a regional petroleum geological study，were applied to the research of the relationship between authigenic m inerals and secondary porosity of the deep clastic reservoirs in the3 rd and4 th members of the Paleogene Shahejie Formation in Jiyang Depression.The result shows that，for the3 rd member，the secondary porosity of the depth intervalwithin3150-3600m are related to the dissolution of acid-soluble components such as carbonatem inerals，while thatwithin4250-4500m are formed by dissolution of alkali-soluble components.In contrast，for the4 th member，the secondary porosity of the depth intervalswithin3350-3600，3950-4200and4500-4900m are formedmainly by dissolution of acid-solublem inerals，and those within5600-5700m are connected with dissolution of alkali-soluble components.For the depth interval of4400-4700m in Chezhen sag，the low content of kaolinite and high content of ledikite coincide wellwith high secondary porosity.For the deep layers in northern Dongying sag and Bonan sag，high content of chlorite coincide relativelywellwith high secondary porosity and present amutualwaning and waxing relationship with the ledikite content.For the depth interval of3500-4800m in the Bonan sag，there is an abnormal clay mineral transforming zone，and high I/S ratios coincide relativelywellwith an abrupt increasing of chlorite and high secˉondary porosity.

Key words: authigenic m ineral, porosity, deep layer, Shahejie Formation, Paleogene, Jiyang Depression