塔里木盆地西北缘二叠系礁灰岩的时空分布特征及其油气地质意义  

Spatio-temporal Distribution and Its Oil—Gas Significances of Permian Reef Limestones on the Northwestern Margin of the Tarim Basin

作　　者：罗金海[1] 车自成[1] 周新源[2] 李勇[2] 李建立[2] 张敬艺[1] 

机构地区：[1]大陆动力学国家重点实验室(西北大学),西北大学地质学系,西安710069 [2]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《地质论评》2007年第5期600-607,共8页Geological Review

摘　　要：对塔里木盆地西北缘二叠系礁灰岩的岩石、岩相、沉积演化和油气地质特征的分析表明,生物礁主要发育于中二叠统栖霞阶昆克拉契组和巴立克立克组,以亮晶藻粘结灰岩为主,具有堤礁的特点。二叠系礁灰岩较大的厚度表明,当时礁体生长速率与礁基沉降(或水体加深)的速率匹配较好,具有进积型沉积的特点,这与当时塔里木地块内部的退积型沉积特点是不一致的。礁灰岩的原生孔隙较小,可以作为中等烃源岩,在哈拉峻盆地的东南侧和乌什凹陷北缘的覆盖区之下可能构成与礁灰岩相关的油气远景区。Analysis of the petrology, lithofacies, sedimentary evolution and petroleum features of Permian reef limestones on the margin of the Tarim basin shows that reef limestones in the Kongkelaqi Formation and Balikelike Formation of Middle Permian consist mainly of the algal-sticking limestones, and occur as reef dam. The larger thickness of the Permian reef limestones suggests that the growing rate of the reef is well matched with the rate of the subsidence of reef base （or rate of the water deepening）, and it is characterized by the advancing sedimentary sequences which is inconsistent with the retreating sedimentary sequence within the Tarim block at the same time. The primary porosity of Permian reef limestones is minor for oil—gas acculation, but Permian reef limestones could be the medium sources. The oil—gas prospect areas related with the Permian reef limestones should exist under the covered areas in the south-eastern margin of the Halajun basin and the northern margin of the Wushi sag.

关 键 词：塔里木 西北缘 二叠系 礁灰岩 时空分布 油气地质 

分 类 号：P618.13[天文地球—矿床学]