渤中凹陷古近系烃源岩生烃潜力评价
发布时间：2019-01-08 12:53
【摘要】：本文综合应用钻井、地震等地质资料以及大量烃源岩样品的地球化学分析资料,对渤中凹陷烃源岩的有机地球化学特征进行了研究,在此基础上利用盆地模拟法和体积法对该区的油气资源潜力进行评价,明确了今后的勘探方向。从有机质丰度、有机质类型及有机质热演化特征等方面综合评价了该区的三套烃源岩,建立一套适用于该区的有机质丰度评价标准,明确有机质类型并划分了各套烃源岩的热演化阶段。结果表明渤中凹陷主要发育三套有效烃源岩:沙三段、沙一-二段及东二下-东三段。其中沙三段烃源岩有机质类型以Ⅰ型和Ⅱ1型为主,有机质丰度最高且已经进入生烃门限,优质烃源岩最为发育;沙二-沙一段主要为Ⅱ1型和Ⅱ2型,有机质类型较好,有机质丰度较高;东营组烃源岩主要以Ⅱ型为主,生烃潜力比沙河街组稍差。根据烃源岩生物标志化合物特征,对烃源岩的有机母质来源、沉积环境和成熟度等进行分析,明确了优质烃源岩的形成条件。研究表明沙三段烃源岩沉积于淡水还原环境,低等水生生物来源为主,有大量的藻类输入;沙一-二段烃源岩沉积于半咸水-咸水的缺氧还原环境,母质来源仍以水生生物为主,但藻类输入较少;东二下-东三段烃源岩沉积于淡水弱还原环境,母质来源以陆生高等植物和菌藻类混合输入为特征。对渤中凹陷烃源岩的生排烃特征进行了研究,确定了产烃率、排烃系数和聚集系数等资源评价的关键参数。依据自然演化剖面和热解数据得到的残余降解率曲线来研究源岩生烃特征并计算产烃率。采用原始生烃潜量法和产率指数法综合分析排烃特征并计算排烃系数。通过合理的选取刻度区和主控因素,采用多因素回归法确定油气聚集系数。落实了渤中凹陷的资源潜力,利用两种方法计算了渤中凹陷烃源岩的生烃量、排烃量和资源量。盆模法和体积法计算渤中凹陷古近系烃源岩生烃总量分别为494.59亿吨和462.4亿吨,其中沙三段生烃量最高,分别为184.5亿吨和194.8亿吨。盆模法和体积法计算的渤中凹陷资源量分别为157.43亿吨和115.62亿吨,资源潜力巨大,可见渤中凹陷及其周缘今后仍然是渤海石油天然气勘探的主要领域。综合多种因素,将渤中凹陷划分为四个次级洼陷带,其中,东北次洼为最有利的勘探次洼,两种方法计算的资源量分别为63.12亿吨和40.77亿吨;西北次洼最低,分别为17.44亿吨和14.53亿吨,明确了有利勘探区。
[Abstract]:In this paper, the organic geochemical characteristics of source rocks in Bozhong sag have been studied by using the geological data such as drilling and seismic data and the geochemical analysis data of a large number of source rock samples. On this basis, the basin simulation method and volume method are used to evaluate the potential of oil and gas resources in this area, and the exploration direction in the future is determined. Three sets of hydrocarbon source rocks in this area are comprehensively evaluated from the aspects of abundance, type and thermal evolution of organic matter, and a set of criteria for evaluating the abundance of organic matter is established. The types of organic matter are defined and the thermal evolution stages of each set of source rocks are divided. The results show that three sets of effective source rocks are mainly developed in Bozhong Sag: the third member of Sha 3, the member 1 to 2 of Sha 1 and the third member of Lower to East part of East second member. The organic matter types of the source rocks of the third member of Sha are mainly type 鈪，
本文编号：2404625
[Abstract]:In this paper, the organic geochemical characteristics of source rocks in Bozhong sag have been studied by using the geological data such as drilling and seismic data and the geochemical analysis data of a large number of source rock samples. On this basis, the basin simulation method and volume method are used to evaluate the potential of oil and gas resources in this area, and the exploration direction in the future is determined. Three sets of hydrocarbon source rocks in this area are comprehensively evaluated from the aspects of abundance, type and thermal evolution of organic matter, and a set of criteria for evaluating the abundance of organic matter is established. The types of organic matter are defined and the thermal evolution stages of each set of source rocks are divided. The results show that three sets of effective source rocks are mainly developed in Bozhong Sag: the third member of Sha 3, the member 1 to 2 of Sha 1 and the third member of Lower to East part of East second member. The organic matter types of the source rocks of the third member of Sha are mainly type 鈪，
本文编号：2404625
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