塔中地区奥陶系良里塔格组礁滩的化石记录和生长序列

新疆石油地质 ›› 2011, Vol. 32 ›› Issue (3): 235-238.

塔中地区奥陶系良里塔格组礁滩的化石记录和生长序列

孙崇浩^1,2, 张正红¹, 王振宇², 于红枫¹, 吉云刚¹, 李新生¹

1.中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒 841000;
2.西南石油大学,成都 610500

收稿日期:2010-10-19 出版日期:2011-06-01 发布日期:2020-08-14
作者简介:孙崇浩（1981-）,男,河南南阳人,博士,储集层地质,（E-mail）sunhao515@163.com.
基金资助:
国家科技重大专项（2008ZX05049）

Fossil Record and Growth Sequence of Lianglitag Reef-Flat Complex of Ordovician in Tazhong Area

SUN Chong-hao^1,2, ZHANG Zheng-hong¹, WANG Zhen-yu², YU Hong-feng¹, JI Yun-gang¹, LI Xin-sheng¹

1. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China;
2. Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2010-10-19 Online:2011-06-01 Published:2020-08-14

摘要/Abstract

摘要： 根据沉积背景和岩石学特征分析,塔中地区奥陶系良里塔格组中可划分出3 类礁建造：格架礁、礁丘和灰泥丘,其中化石丰富,具有承前启后的重要作用。造礁生物有菌藻、钙藻、珊瑚、海绵、苔藓虫和层孔虫等,附礁生物有介形类、腹足类、腕足类和棘皮类等。在生物礁的演化阶段上,发育完整的造礁生物生长序列,出现拓殖期—泛殖期—衰亡期的阶段演化;礁的生长过程中,生物属种、含量和组合特征均表现出明显的演替。通过分析认为,塔中地区生物礁单个礁体厚度大、发育旋回多,多期礁滩组合规模大,礁体微相发育完善,沿台地边缘成群、成带分布。生物礁和粒屑滩组合发育形成大型的礁滩复合体,为形成大型礁滩型油气藏奠定了良好的基础。

关键词: 塔里木盆地, 塔中地区, 上奥陶统, 良里塔格组, 生物礁滩, 化石组成, 演替

Abstract: From analysis of the sedimentary setting and lithologic feature, Lianglitag formation of the Ordovician in Tazhong area can be divided into three reef formations, namely, framework reef, reef hill and chalky clay hill, within which fossils are so abundant that they play an important role in serving as a link between past and future. The reef-forming organisms are bacterial algae, calcareous algae, coral, sponge, polyzoa, stromatoporoid, etc., the reef-settled organisms are ostracoda, gastropo, brachiopoda and echinoderm, etc. In evolution stage of the organic reef, the reef-forming organism growing sequence is complete, existing advanced starting reproduction stage-broad reproduction stagedeclining stage. In the process of reef growth, the genus-species, abundance and assemblages appear obvious evolutionary and syngenetic characteristics. The analysis suggests that the reefs in Tazhong are characterized by big thickness of single reef, multiple cycles of development, large-scale multistage reef-flat assemblage, reef rmicrofacies well development and grouping-zoning distribution along the platform margin. The large scale of reef complex shaped by organic reef and grain flat combination provides good fundation for shaping the large scale of reefflat petroleum reservoir in this area.

Key words: Tarim basin, Tazhong area, Upper Ordovician, Lianglitag formation, organic reef flat, fossil assemblage, syngenetics

中图分类号:

TE112.221

孙崇浩, 张正红, 王振宇, 于红枫, 吉云刚, 李新生. 塔中地区奥陶系良里塔格组礁滩的化石记录和生长序列[J]. 新疆石油地质, 2011, 32(3): 235-238.

SUN Chong-hao, ZHANG Zheng-hong, WANG Zhen-yu, YU Hong-feng, JI Yun-gang, LI Xin-sheng. Fossil Record and Growth Sequence of Lianglitag Reef-Flat Complex of Ordovician in Tazhong Area[J]. Xinjiang Petroleum Geology, 2011, 32(3): 235-238.

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