摘要
早白垩世铜钵庙—南屯组的火山岩和砂岩是中国海拉尔盆地贝尔凹陷和蒙古国塔木察格盆地塔南凹陷的主要油气储层。其中:铜钵庙组储层主要由火山碎屑岩组成;南屯组储层以砂岩为主,其次为火山碎屑岩。在铜钵庙组的火山碎屑岩中,贝尔凹陷主要为凝灰岩,塔南凹陷主要为沉凝灰岩和凝灰质砂岩。镜质体反射率和最高热解温度数据表明,成岩阶段主要为中成岩阶段A期。铜钵庙组—南屯组储层的孔隙类型主要为次生孔,其次为原生孔,属中低孔、特低渗型储层。贝尔凹陷和塔南凹陷均发育2个异常高孔隙带,储层孔隙度主要受储层岩石类型、沉积相和成岩作用控制。
The pyroclastic rocks and sandstones of Tongbomiao - Nantun Formation of Early Cretaceous are an important oil reservoir in the Beier depression, Hailarer basin, China and in the Tanan depression, Tamtsag basin, Mongolia. The reservoir in Tongbomiao Formation consists of mainly pyroclastic rocks with a less proportion of sandstones, in contrast, the reservoir in Nantun Formation is predominantly sandstones, although significant percentages of pyroclastic rocks are present. The pyroclastic rocks are gradually decreased from Tongbomiao Formation to Nantun Formation. The pyroclastie rocks of Tongbomiao Formation are composed of tuff in Beier depression, and composed of tuffite and tuffaceous sandstone in Tanan depression. According to the data of vitrinite reflectance and rock maxima pyrolysis temperature,the diagenetic stage of the pyroclastic rocks mainly belong to period A of middle diagenetic stage. The pore type in pyroclastie rock reservoir mainly is secondary pore as well as primary pore. The measurement of porosity and permeability indicate that pyroclastic rock is middle - low porosity, extra low permeability reservoir. Two abnormal high porosity belts are found respectively in Beier depression and Tanan depression. Porosity of reservoir is mainly controlled by the component of detrital material, the sedimentary environment and the diagenesis.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第6期1232-1240,共9页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(40972075)
教育部博士点基金项目(20070183137)
关键词
贝尔凹陷
塔南凹陷
储层特征
控制作用
孔隙度
油气
Beier depression
Tanan depression
reservoir characteristics
processes controlling porosity
porosity
petroleum gas
