砂岩介质下陆相原油裂解生气模拟

继四川盆地、塔里木盆地发现大量的海相原油裂解气气田之后,在渤海湾、柴达木等陆相盆地也发现存在陆相原油裂解气,但目前对陆相原油裂解气的生气机理、主控因素以及与海相原油裂解气差异性研究还不够.采用封闭体系黄金管热模拟实验方法,选取陆相原油样品开展裂解模拟实验.结果 表明:①陆相原油在高演化阶段可以大量裂解生气,陆相纯原油系...

Simulation of pyrolytic gas generation of continental crude oil in sandstone medium

A large number of marine crude oil cracking gas fields have been found in Sichuan and Tarim basins,and continental crude oil cracking gas has also been found in Bohai Bay and Qaidam basins.However,there is not enough research on the mechanism of continental crude oil cracking gas,the main contR_Olling factors and the difference between continental crude oil cracking gas and marine crude oil cracking gas.In this paper,a closed system gold tube pyR_Olytic experiment was used to simulate the pyR_Olysis of continental crude oil samples.The results show that:(1)Continental crude oil can generate a lot of pyR_Olytic gas in the high thermal evolution stage,and the R_Ovalue corresponding to the main gas generation period of continental pure crude oil series is1.7%-3.3%.(2)The R_Ovalues corresponding to the main gas generation period of sandstone media series are1.7%-2.6%,which can catalyze the cracking of continental crude oil.(3)There are three stages in the pR_Ocess of continental crude oil cracking:the initial cracking stage is when R_O=0.9%-1.6%,the massive cracking stage is R_O=1.6%-2.1%,and the exhaustion stage is R_O=2.1%-4.2%.(4)Carbon isotopes of pure crude oil under the medium of pure oil and sandstone show similar changes with the increase of temperature.Carbon isotopes of ethane and pR_Opane are reversed in the late stage of crude oil cracking.With the development of deep exploration,more and more continental oil cracking gas reservoirs will be found.Therefore,it is important to study the gas generation mechanism and gas pR_Oduction characteristics of continental crude oil cracking gas to find and discover large-scale continental crude oil cracking gas fields or reservoirs.