火山碎屑岩储层异常高孔隙成因——以南贝尔凹陷东次凹北洼槽为例

doi:10.7623/syxb201205010

石油学报 ›› 2012, Vol. 33 ›› Issue (5): 814-821.DOI: 10.7623/syxb201205010

火山碎屑岩储层异常高孔隙成因——以南贝尔凹陷东次凹北洼槽为例

张丽媛 1　纪友亮 1　刘　立 2　张　革 3　赵　磊 1　穆涵宜 1

1　中国石油大学油气资源与探测国家重点实验室　北京　102249；　2　吉林大学地球科学学院　吉林长春　130061；　3　大庆油田有限责任公司勘探开发研究院　黑龙江大庆　163712

收稿日期:2012-02-27 修回日期:2012-06-24 出版日期:2012-09-25 发布日期:2012-11-27
通讯作者: 张丽媛
作者简介:张丽媛，女，1985年9月生，2010年获吉林大学硕士学位，现为中国石油大学（北京）博士研究生，主要从事储层地质学、沉积学及层序地层学方面的研究。
基金资助:
国家自然科学基金项目（No.40972075）和国家重大科技专项（2011ZX05003－002）资助。

Origin of anomalously high porosity in pyroclastic reservoirs: a case study on the northern region of the east sub-sag in Nanbeier sag

ZHANG Liyuan 1　JI Youliang 1　LIU Li 2　ZHANG Ge 3　ZHAO Lei 1　MU Hanyi 1

Received:2012-02-27 Revised:2012-06-24 Online:2012-09-25 Published:2012-11-27

摘要/Abstract

摘要：

南贝尔凹陷东次凹北洼槽铜钵庙组—南屯组发育火山碎屑岩储层，在纵向上存在5个异常高孔隙带，其深度分布范围分别为1450~1500 m、1560 ~1775 m、1840~2030 m、2110~2230 m、2330~2520 m。针对上述5个异常高孔隙带，应用普通薄片、铸体薄片、铸体图像分析、扫描电镜、黏土矿物X射线衍射等多种测试手段，对其成因进行研究。研究结果表明：异常高孔隙的形成主要与凝灰质成分的溶蚀溶解作用有关，凝灰质成分易于发生溶蚀是形成异常高孔隙的根本原因；有机质热演化过程中产生的有机酸是溶蚀溶解作用得以进行的主要营力；有利的沉积相带空间配置关系是控制异常高孔隙带空间分布的主要因素；高岭石向绿泥石转化产生的无机酸对于异常高孔隙的形成有一定贡献。

关键词: 火山碎屑岩, 异常高孔隙, 凝灰质成分, 溶蚀, 溶解

Abstract:

Pyroclastic rocks of Tongbomiao-Nantun Formation are an important oil reservoir in the northern region of the east sub-sag in Nanbeier sag. Vertically there are five anomalously high porosity zones at depths of 1450~1500 m, 1560~1775 m, 1840~2030 m, 2110~2230 m and 2330~2520 m, respectively. The origin of the anomalously high porosity zones was studied by applying various measurements, such as normal thin-section, cast thin-section, cast image analysis, scanning electron microscope and X-ray diffraction of clay minerals. The result showed that the genesis of anomalously high porosity is directly bound up with the corrosion and dissolution of tuffaceous components. The susceptibility of tuffaceous components to corrosion is a key reason for the formation of anomalously high porosity, and the organic acid generated in thermal evolution of organic matter is a main force to drive corrosion and dissolution. The suitable space relation of sedimentary facies is a primary factor controlling the distribution of anomalously high porosity zones. Besides, the inorganic acid produced during the process of transformation from kaolinite to chlorite can make a certain contribution to anomalously high porosity.

Key words: pyroclastic rock, anomalously high porosity, tuffaceous component, corrosion, dissolution

张丽媛　纪友亮　刘　立　张　革　赵　磊　穆涵宜. 火山碎屑岩储层异常高孔隙成因——以南贝尔凹陷东次凹北洼槽为例[J]. 石油学报, 2012, 33(5): 814-821.

ZHANG Liyuan　JI Youliang　LIU Li　ZHANG Ge　ZHAO Lei　MU Hanyi. Origin of anomalously high porosity in pyroclastic reservoirs: a case study on the northern region of the east sub-sag in Nanbeier sag[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(5): 814-821.

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火山碎屑岩储层异常高孔隙成因——以南贝尔凹陷东次凹北洼槽为例

Origin of anomalously high porosity in pyroclastic reservoirs: a case study on the northern region of the east sub-sag in Nanbeier sag

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