王府德惠断陷断陷期埋藏史热史生烃史研究

发布时间：2018-04-27 16:06

  本文选题：埋藏史 + 热演化史　； 参考：《东北石油大学》2015年硕士论文

【摘要】：王府、德惠断陷是松辽盆地的二级构造单元,断陷期地层从下到上为火石岭组、沙河子组、营城组。本论文以有机质丰度、有机质类型、有机质成熟度等作为烃源岩的地球化学特征评价的切入点,结合地质、地球物理和地球化学相关资料,用盆地模拟技术恢复研究区埋藏史,在埋藏史恢复的基础上利用EASY%Ro原理结合三角函数热流模型反演研究区的热史,再结合有关动力学参数和烃源岩地球化学特征来计算生烃史。本论文取得了以下认识:1、两个断陷有机质丰度均达到很好的级别,营城组稍差。有机质类型火石岭组主要为Ⅱ型,营城组和沙河子组稍差。断陷期地层成熟度Ro均在1.25%~1.75%之间,处于成熟~高成熟之间。2、两个断陷埋藏史相似。沙河子到营城组快速埋藏,营城末期地层抬升明显,德惠断陷比王府在此阶段抬升幅度大,其程度由北向南剥蚀量越来越大。3、两个断陷热演化史大致分成3个阶段,断陷期(火石岭组~营城组)的由高地温梯度到低地温梯度的下降阶段,地层温度升温较快;拗转换期至坳陷期(登娄库组至嫩江组初期)的地温梯度缓慢上升阶段,地层温度快速升高;嫩江组初期达到最大埋深,对应的地层温度达到最高,反转期的稳定地温梯度阶段。现今成熟度达到最高。4、结合之前的埋藏史、热史、干酪根动力学参数及油裂解活化能参数可以得出:王府和德惠断陷的火石岭组的生烃主要成分是C6+,二者的生烃期相近,都是105Ma~75Ma之间,对应于泉头组时期和嫩江时期。生烃时间早,持续时间也短。沙河子组大量生气期在115Ma~88Ma之间,对应于泉头组时期和姚家组末期。营城组在114Ma~84Ma之间。对应于泉头组末期和姚家组初期。两个断陷火石岭组生油裂解时间相近,为90~70Ma之间。考虑到热史可知,裂解时间一定在生烃完成后,由于沉降史温度会在后期升高,结合成烃和就近成藏因素,可知生成的油裂解所占比例是70%,油裂解门限在Ro=1.1%。
[Abstract]:Wangfu, Dehui fault depression is the secondary structural unit of Songliao basin. The strata in the faulted period from lower to upper are Huoshiling formation, Shahezi formation and Yingcheng formation. In this paper, the abundance of organic matter, the type of organic matter and the maturity of organic matter are taken as the entry points for the evaluation of geochemical characteristics of source rocks. The burial history of the studied area is restored by basin simulation technique, combining with the relevant data of geology, geophysics and geochemistry. Based on the restoration of burial history, the thermal history of the studied area is inversed by using EASY%Ro principle and trigonometric function heat flow model, and the hydrocarbon generation history is calculated by combining the relevant kinetic parameters and geochemical characteristics of source rocks. In this paper, we have obtained the following understanding: 1: 1, the abundance of organic matter in the two faulted subsidence reaches a good level, and the Yingcheng formation is a little poor. The organic matter type of Huoshiling formation is mainly type 鈪，

本文编号：1811396