泌阳凹陷下二门地区浅层油气源分析及勘探启示

An Analysis of Shallow Oil and Gas Sources and Exploration Enlightenment in Xiaermen Area of Biyang Depression

金芸芸 石正勇 任霄宇

JIN Yunyun SHI Zhengyong REN Xiaoyu

中国石化河南油田石油勘探开发研究院, 河南 南阳 473132

Exploration and Development Research Institute of Henan Oilfield Company, SINOPEC, Nanyang, Henan 473132, China

为了弄清泌阳凹陷下二门地区浅层油气来源及天然气成因，运用多种有机地球化学评价方法，建立下二门地区烃源岩评价地化综合剖面，剖析油源关系，对天然气组分及稳定碳同位素进行了分析。研究认为，下二门地区核桃园组烃源岩有机质丰度高，类型以I-Ⅱ型为主，成熟门限为2 200 m左右，浅层烃源岩以低熟为主，H段处于成熟阶段；浅层低熟原油以H亚段烃源岩生成的烃类沿断层向上运移为主，并受到浅层低熟烃源岩的侵染而形成的混源油；天然气为生物-热催化过渡带气。厘清油气来源，有利于指导下二门地区下步勘探部署。

In order to find out the source of shallow oil and gas and the genesis of natural gas in Xiaermen Area of Biyang Depression, a comprehensive geochemical profile of source rock evaluation in Xiaermen Area is established by using various organic geochemical evaluation methods, and the relationship between oil and gas sources is analyzed. The composition and stable carbon isotope of natural gas are analyzed. The results show that the source rocks of Hetaoyuan Formation in Xiaermen Area are rich in organic matter, mainly of type I-Ⅱ, with a maturity threshold of about 2 200 m, the shallow source rock is dominated by low maturity, H is in the mature stage; the shallow low maturity crude oil is dominated by the hydrocarbon generated by the upper H source rock moving upward along the fault, and the mixed source oil formed by the infection of the shallow low maturity source rock; the natural gas is the bio-thermal catalytic transition zone gas. To clarify the source of oil and gas is conducive to guiding the next exploration and deployment in Xiaermen Area.

10.11885/j.issn.1674-5086.2019.06.25.01