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  

Distribution and hydrocarbon generation potential of the Nanhua-Cambrian source rocks in Tarim Basin

作　　者：张科[1] 潘文庆[1] 苏劲[2] 张敏[1] Zhang Ke;Pan Wenqing;Su Jin;Zhang Min(Research Institute of Exploration&Development,PetroChina Tarim Oilfield Company;PetroChina Research Institute of Petroleum Exploration&Development)

机构地区：[1]中国石油塔里木油田公司勘探开发研究院 [2]中国石油勘探开发研究院

出　　处：《中国石油勘探》2022年第4期121-134,共14页China Petroleum Exploration

基　　金：国家重点研发计划“塔里木盆地盐下超深层油气分布规律及有利勘探区带评价”(2019YFC0605505);中国石油天然气股份有限公司科学研究与技术开发项目“塔里木盆地震旦系白云岩储层建模与有利区带评价”(2020D-5010-28)。

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7500×10^(8) t油当量,是对塔里木盆地海相油气资源贡献最大的烃源岩。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 7500×10^(8) t oil equivalent,which contribute the most to marine oil and gas resources in Tarim Basin.

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 

分 类 号：TE122[石油与天然气工程—油气勘探]