摘要
苏北盆地高邮凹陷蕴藏着十分丰富的油气资源,勘探前景良好。根据原油物性、饱和烃和芳烃地球化学特征精细剖析,对高邮凹陷多个典型油田原油的沉积环境、生源输入及成熟度等特征进行研究,厘定高邮凹陷原油不同成因类型。研究结果表明,高邮凹陷原油来源于具有一定水体咸度的还原性环境,有机质生源为混合源,属于成熟原油。根据原油沉积环境、母质来源和成熟度特征,原油成因类型可划分为两大类:第一类原油姥植比一般比较低,补身烷/升补身烷比值一般接近1或者大于1,C_(21)TT/C_(23)TT比值较低,C_(24)四环萜烷/C_(26)三环萜烷比值较小,C_(29)降藿烷/C_(30)藿烷比值较低,规则甾烷C_(27)、C_(28)、C_(29)呈现不对称“L”形分布,原油沉积环境为还原环境,母质来源于混合型为主且高等植物输入稍高,属于成熟原油,此类原油主要分布在赤岸、陈堡、瓦庄和沙埝等油田;第二类原油上述参数与第一类原油截然相反,该类原油沉积环境的还原程度比一类油稍低,母质来源属于典型的双重输入混合型,相比于一类油高等植物占比较少,属于成熟原油,此类原油主要分布在马家嘴、邵伯、许浅1和黄珏等油田。
Gaoyou sag in Subei basin is rich in oil and gas resources and has good exploration prospects.Based on the detailed analysis of crude oil physical properties,the geochemical characteristics of saturate and aromatic hydrocarbons,the sedimentary environment,source input and maturity of crude oil from several typical oilfields in Gaoyou sag were studied,and the different genetic types of crude oil in Gaoyou sag were determined.It is found that the crude oil in Gaoyou sag comes from the reducing environment with high salinity,and the source of organic matter is a mixed source,which belongs to mature crude oil.According to the sedimentary environment,parent material source and maturity characteristics of crude oil,the genetic types of crude oil can be divided into two categories:the first type of crude oil generally has a low planting ratio,the ratio of C_(15)8β(H)-drimane/C_(16)8β(H)-homodrimane is generally close to or greater than 1,the ratio of C_(21)TT/C_(23)TT is low,the ratio of C_(24)tetracyclic terpane/C_(26)tricyclic terpane is small,the ratio of C_(29)norhopane/C_(30)hopane is low,and the distribution of regular steranes C_(27),C_(28)and C_(29)is asymmetric“L”,The sedimentary environment of crude oil is reductive environment.The parent material is mainly from mixed type,and the input of higher plants is slightly higher.It belongs to mature crude oil.This kind of crude oil is mainly distributed in Chian,Chenbao,Wazhuang,Shanian and other oilfields;The above parameters of the second type of crude oil are completely opposite to the first type of crude oil,and the reduction degree of the sedimentary environment of this type of crude oil is slightly lower than that of the first type of crude oil;The source of parent material belongs to the typical dual input mixed type.Compared with class I oil,higher plants account for less and belong to mature crude oil.This kind of crude oil is mainly distributed in Majiazui,Shaobo,Xuqian 1 and Huangjue oil fields.
作者
金秀辉
李洪波
张敏
田兴民
JIN Xiuhui;LI Hongbo;ZHANG Min;TIAN Xingmin(Key Laboratory of Oil and Gas Resources and Exploration Technology,Hubei Provincial Key Laboratory of Oil and Gas Geochemistry and Environment,School of Resources and Environment,Yangtez University,Wuhan 430100,China)
出处
《科技和产业》
2023年第2期232-238,共7页
Science Technology and Industry
基金
国家自然科学基金项目(42072165)
长江大学青年创新团队项目(PI2021-05)。
作者简介
金秀辉(1993-),男,安徽六安人,长江大学资源与环境学院,硕士研究生,研究方向为油气地球化学;通信作者:李洪波(1981-),男,湖北宜昌人,长江大学资源与环境学院,副教授,油气地球化学博士,研究方向为油气地球化学。
