塔里木盆地南华系—寒武系烃源岩时空分布与生烃潜力评价

doi:10.3969/j.issn.1672-7703.2022.04.009

摘要/Abstract

摘要： 塔里木盆地海相油气储量规模大，目前发现的下寒武统烃源岩TOC高，但厚度薄，能否支撑目前储量规模仍不确定，同时前寒武系烃源岩的发育情况及其对海相油气的成藏贡献不清。为了更全面地评价塔里木盆地海相油气资源的潜力，利用碳同位素地层曲线、沉积充填和地震反射特征，建立了塔里木盆地南华系—寒武系与全球的地层对比格架，识别出南华系特瑞艾肯组、震旦系育肯沟组和水泉组等潜在烃源岩，明确了寒武系烃源岩发育的层段、厚度和有机质丰度。创新建立了烃源岩TOC归一化评价技术，更加精确地反映地层中有机碳的含量。通过烃源岩生烃评价，计算出寒武系烃源岩的油气资源量约为7500×10⁸t油当量，是对塔里木盆地海相油气资源贡献最大的烃源岩。

关键词: 南华系—寒武系, 地层格架, 烃源岩, TOC归一化厚度, 生烃评价

Abstract: Tarim Basin has large scale marine oil and gas reserves. However, it is still uncertain whether the Lower Cambrian source rocks which have high TOC content but thin thickness are sufficient for the current huge reserves. On the other hand, there is a lack of understanding on the development of the Precambrian source rocks and their contribution to hydrocarbon accumulation. In order to comprehensively evaluate the potential of marine oil and gas resources in Tarim Basin, the carbon isotope curve, sedimentary filling and seismic reflection characteristics are used to establish the stratigraphic correlation framework of Nanhua-Cambrian between Tarim Basin and the world, identify the potential source rocks of the Nanhua Triaiken Formation, Sinian Yukengou Formation and Shuiquan Formation, and define the development section, thickness and TOC of the Cambrian source rocks. Furthermore, an innovated technology of TOC normalized evaluation of source rocks is established, which enables to more accurately reflect the organic carbon abundance of source rocks. The hydrocarbon generation evaluation of source rocks indicates that oil and gas resources of the Cambrian source rocks are about 7500×10⁸ t oil equivalent, which contribute the most to marine oil and gas resources in Tarim Basin.

中图分类号:

TE122

张科, 潘文庆, 苏劲, 张敏. 塔里木盆地南华系—寒武系烃源岩时空分布与生烃潜力评价[J]. 中国石油勘探, 2022, 27(4): 121-134.

Zhang Ke, Pan Wenqing, Su Jin, Zhang Min. Distribution and hydrocarbon generation potential of the Nanhua-Cambrian source rocks in Tarim Basin[J]. China Petroleum Exploration, 2022, 27(4): 121-134.

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