塔里木盆地哈拉哈塘地区石炭系东河砂岩段碳酸盐胶结物沉积特征及其成因

doi:10.13278/j.cnki.jjuese.20190269

摘要/Abstract

摘要： 塔里木盆地石炭系东河砂岩是我国典型的深埋海相碎屑岩优质储层，储集砂体物性好，但受碳酸盐胶结物影响导致非均质性较强。为了更准确地预测优质储层发育带，通过精细岩心观察、大量薄片鉴定及碳氧同位素和阴极发光资料分析，对哈拉哈塘地区石炭系东河砂岩段碳酸盐胶结物宏观及微观沉积特征和成因进行了研究。研究发现：前滨及上临滨相带砂岩含油性较好，不含油的含碳酸盐胶结物砂层主要有Ⅰ类生物潜穴型、Ⅱ类层理纹层型、Ⅲ类薄层灰质砂岩型和Ⅳ类钙质砂岩团块型4种岩性组合；碳酸盐胶结物主要类型为方解石，其次为铁方解石，主要填充在溶蚀粒间孔及碎屑颗粒粒内溶孔中。东河砂岩储层中碳酸盐胶结物主要为有机酸脱羧成因，常见于Ⅱ、Ⅲ类岩性组合；少量生物成因及沉积暴露成因，主要见于Ⅰ类和Ⅳ类岩性组合。研究区碳酸盐胶结物δ¹³C较高的关键原因是东侧轮南低凸起的奥陶系碳酸盐岩地层侵蚀溶蚀供给。

关键词: 碳酸盐胶结物, 沉积特征, 碳氧同位素, 东河砂岩, 塔里木盆地

Abstract: The Carboniferous Donghe sandstone in Tarim basin is a typical deep-buried marine clastic reservoir in China, which has good physical properties and strong heterogeneity influenced by carbonate cements. In order to predict the beneficial zones of high quality reservoir more accurately, the authors studied the sedimentary characteristics and genesis of the carbonate cements in Donghe sandstone through core observation, variety of thin section identification, carbon and oxygen isotope, and cathodoluminescence analyses. It indicates the sandstones on foreshore and upper shore face are rich in oil, while the oil-free sandstones contain four types of carbonate cement:Ⅰ-biological burrow type, Ⅱ-bedding-laminae type, Ⅲ-thin calcareous sandstone intercalated in thick sandstone type, and Ⅳ-calcareous sandstone globular type. The carbonate cements include more calcite and some ferro-calcite, which usually fill in the intergranular and intragranular dissolved pores. The genesis of carbonate cements in Donghe sandstone is more organic acid decarboxylation in type Ⅱ and type Ⅲ lithologic associations; and some of the type Ⅰ and type Ⅳ are biogenesis and outcrop sedimentology. The key reason of heavy δ¹³C in the study area is the erosion and solution of Ordovician carbonate rocks from the eastern Lunnan low salience.

Key words: carbonate cements, sedimentary characteristics, carbon and oxygen isotope, Donghe sandstone, Tarim basin

中图分类号:

P588.212

陈秀艳, 王剑, 张立平, 马德波, 周波. 塔里木盆地哈拉哈塘地区石炭系东河砂岩段碳酸盐胶结物沉积特征及其成因[J]. 吉林大学学报(地球科学版), 2020, 50(2): 509-517.

Chen Xiuyan, Wang Jian, Zhang Liping, Ma Debo, Zhou Bo. Sedimentary Characteristics and Genesis of Carbonate Cements in Carboniferous Donghe Sandstone Member, Hanilcatam Area of Tarim Basin[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 509-517.

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