基于盆地钻遇中下寒武统18口井的岩心、薄片和单井资料及两条露头剖面,开展微区（指在不同成岩作用事件中形成的同类成岩矿物）地球化学分析和储集层溶蚀模拟实验,研究塔里木盆地中下寒武统白云岩储集层类型、成因和分布。塔里木盆地中下寒武统发育台缘礁滩、台内丘滩和台内膏云岩3类白云岩储集层,其中,台内膏云岩储集层又可分为潜山型和内幕型两个亚类;储集层岩石类型有藻礁（丘）白云岩、砂屑白云岩和膏云岩,藻礁（丘）白云岩储集层以藻格架（溶）孔为主,砂屑白云岩储集层以粒间、粒内（溶）孔及晶间（溶）孔为主,膏云岩储集层以石膏铸模孔及微孔隙为主。礁滩相和膏云坪沉积中的沉积原生孔是储集层发育的关键,准同生期未白云石化的灰质、膏质为早表生溶蚀孔洞的发育奠定了物质基础,准同生白云石化作用形成的白云岩构成坚固的岩石格架对孔隙起到保护作用。中下寒武统台缘礁滩储集层既有规模,储集层物性又好,是非常现实的勘探对象,而下寒武统肖尔布拉克组台内礁滩储集层和中下寒武统内幕型膏云岩储集层的潜力较好。图9参12
Based on cores, thin sections and drilling data of 18 wells and two outcrop profiles of the Lower-Middle Cambrian in the Tarim Basin, geochemical analysis of multi-parameters in micro-area (the same type of diagenetic minerals formed in different diagenetic events) and reservoir dissolution modeling were carried out to find out the types, origin and distribution of Lower-Middle Cambrian dolomite reservoirs. There develop three types of dolomite reservoirs, margin reef-shoal reservoir, platform interior mound-shoal reservoir and platform interior gypsodolomite reservoir. The rock types include algae dolomite, grain dolomite, and gypsodolomite; the pore types in them include algae framework pores in algae dolomite; intergranular pores, intra-granular dissolved pores, inter-crystalline dissolved pores in grain dolomite and gypsum-dissolved pore gypsodolomite. The primary pores in sediments of reef-shoal facies and gypsodolomite flat are the key to the development of the dolomite reservoirs, some aragonite and calcite are the material basis of dissolution in early supergene stage, and the dolomite formed in penecontemporaneous dolomitization acts as strong rock skeleton to protect the primary pores from destructive effect in burial stage. The margin reef-shoal reservoirs, large in scale and good in physical properties, are the most practical exploration targets; furthermore, the platform interior reef-shoal reservoirs in Lower Cambrian Xiaoerbulake Formation and platform interior gypsodolomite reservoir in the Middle-Lower Cambrian have higher oil and gas potential.
[1] 胡广, 刘文汇, 腾格尔, 等. 塔里木盆地下寒武统泥质烃源岩成烃生物组合的构造-沉积环境控制因素[J]. 石油与天然气地质, 2014, 35(5): 685-695.
HU Guang, LIU Wenhui, TENGGER, et al. Tectonic-sedimentary constrains for hydrocarbon generating organism assemblage in the Lower Cambrian argillaceous source rocks, Tarim Baisn[J]. Oil & Gas Geology, 2014, 35(5): 685-695.
[2] 王招明, 谢会文, 陈永权, 等. 塔里木盆地中深1井寒武系盐下白云岩原生油气藏的发现与勘探意义[J]. 中国石油勘探, 2014, 19(2): 1-13.
WANG Zhaoming, XIE Huiwen, CHEN Yongquan, et al. Discovery and exploration of Cambrian subsalt dolomite original hydrocarbon reservoir at Zhongshen-1 well in Tarim Basin[J]. China Petroleum Exploration, 2014, 19(2): 1-13.
[3] 黄智斌, 吴绍祖, 赵治信, 等. 塔里木盆地及周边综合地层区划[J]. 新疆石油地质, 2002, 23(1): 13-17.
HUANG Zhibin, WU Shaozu, ZHAO Zhixin, et al. The composite regional stratigraphic classification in Tarim Basin and its circumference[J]. Xinjiang Petroleum Geology, 2002, 23(1): 13-17.
[4] 宋金民, 罗平, 杨式升, 等. 塔里木盆地下寒武统微生物碳酸盐岩储集层特征[J]. 石油勘探与开发, 2014, 41(4): 404-413.
SONG Jinmin, LUO Ping, YANG Shisheng, et al. Reservoirs of lower Cambrian microbial carbonates, Tarim Basin, NW China[J]. Petroleum Exploration and Development, 2014, 41(4): 404-413.
[5] ADAMS J E, RHODES M L. Dolomitization by seepage refluxion[J]. AAPG Bulletin, 1960, 44(12): 1921-1920.
[6] GRAHAM R D, LANGHORNE B, SMITH J R. Structurally controlled hydrothermal dolomite reservoir facies: An overview[J]. AAPG Bulletin, 2006, 90: 1641-1690.
[7] 赵文智, 沈安江, 郑剑锋, 等. 塔里木、四川及鄂尔多斯盆地白云岩储层孔隙成因探讨及对储层预测的指导意义[J]. 中国科学: 地球科学, 2014, 44(9): 1925-1939.
ZHAO Wenzhi, SHEN Anjiang, ZHENG Jianfeng, et al. The porosity origin of dolostone reservoirs in the Tarim, Sichuan and Ordos basins and its implication to reservoir prediction[J]. SCIENCE CHINA Earth Sciences, 2014, 57(10): 2498-2511.
[8] 郑剑锋, 沈安江, 刘永福, 等. 塔里木盆地寒武系与蒸发岩相关的白云岩储层特征及主控因素[J]. 沉积学报, 2013, 31(1): 89-98.
ZHENG Jianfeng, SHEN Anjiang, LIU Yongfu, et al. Main controlling factors and characteristics of Cambrian dolomite reservoirs related to evaporite in Tarim Basin[J]. Acta Sedimentologica Sinica, 2013, 31(1): 89-98.
[9] 赵文智, 沈安江, 胡安平, 等. 海相碳酸盐岩储集层发育主控因素[J]. 石油勘探与开发, 2015, 42(5): 545-554.
ZHAO Wenzhi, SHEN Anjiang, HU Anping, et al. Major factors controlling the development of marine carbonate reservoirs[J]. Petroleum Exploration and Development, 2015, 42(5): 545-554.
[10] 张静, 胡见义, 罗平, 等. 深埋优质白云岩储集层发育的主控因素与勘探意义[J]. 石油勘探与开发, 2010, 37(2): 203-210.
ZHANG Jing, HU Jianyi, LUO Ping, et al. Master control factors of deep high-quality dolomite reservoirs and the exploration significance[J]. Petroleum Exploration and Development, 2010, 37(2): 203-210.
[11] 李保华, 邓世彪, 陈永权, 等. 塔里木盆地柯坪地区下寒武统台缘相白云岩储层建模[J]. 天然气地球科学, 2015, 26(7): 1233-1244.
LI Baohua, DENG Shibiao, CHEN Yongquan, et al. The reservoir modeling of platform margin dolostone of Xiaoerblak Formation, Lower Cambrian, Kalpin Area, Tarim Basin[J]. Natural Gas Geoscience, 2015, 26(7): 1233-1244.
[12] 赵文智, 沈安江, 周进高, 等. 礁滩储集层类型、特征、成因及勘探意义: 以塔里木和四川盆地为例[J]. 石油勘探与开发, 2014, 41(3): 257-267.
ZHAO Wenzhi, SHEN Anjiang, ZHOU Jingao, et al. Types, characteristics, origin and exploration significance of reef-shoal reservoirs: A case study of Tarim Basin, NW China and Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2014, 41(3): 257-267.
