【摘要】：本文綜合應用鉆井、地震等地質(zhì)資料以及大量烴源巖樣品的地球化學分析資料,對渤中凹陷烴源巖的有機地球化學特征進行了研究,在此基礎上利用盆地模擬法和體積法對該區(qū)的油氣資源潛力進行評價,明確了今后的勘探方向。從有機質(zhì)豐度、有機質(zhì)類型及有機質(zhì)熱演化特征等方面綜合評價了該區(qū)的三套烴源巖,建立一套適用于該區(qū)的有機質(zhì)豐度評價標準,明確有機質(zhì)類型并劃分了各套烴源巖的熱演化階段。結果表明渤中凹陷主要發(fā)育三套有效烴源巖:沙三段、沙一-二段及東二下-東三段。其中沙三段烴源巖有機質(zhì)類型以Ⅰ型和Ⅱ1型為主,有機質(zhì)豐度最高且已經(jīng)進入生烴門限,優(yōu)質(zhì)烴源巖最為發(fā)育;沙二-沙一段主要為Ⅱ1型和Ⅱ2型,有機質(zhì)類型較好,有機質(zhì)豐度較高;東營組烴源巖主要以Ⅱ型為主,生烴潛力比沙河街組稍差。根據(jù)烴源巖生物標志化合物特征,對烴源巖的有機母質(zhì)來源、沉積環(huán)境和成熟度等進行分析,明確了優(yōu)質(zhì)烴源巖的形成條件。研究表明沙三段烴源巖沉積于淡水還原環(huán)境,低等水生生物來源為主,有大量的藻類輸入;沙一-二段烴源巖沉積于半咸水-咸水的缺氧還原環(huán)境,母質(zhì)來源仍以水生生物為主,但藻類輸入較少;東二下-東三段烴源巖沉積于淡水弱還原環(huán)境,母質(zhì)來源以陸生高等植物和菌藻類混合輸入為特征。對渤中凹陷烴源巖的生排烴特征進行了研究,確定了產(chǎn)烴率、排烴系數(shù)和聚集系數(shù)等資源評價的關鍵參數(shù)。依據(jù)自然演化剖面和熱解數(shù)據(jù)得到的殘余降解率曲線來研究源巖生烴特征并計算產(chǎn)烴率。采用原始生烴潛量法和產(chǎn)率指數(shù)法綜合分析排烴特征并計算排烴系數(shù)。通過合理的選取刻度區(qū)和主控因素,采用多因素回歸法確定油氣聚集系數(shù)。落實了渤中凹陷的資源潛力,利用兩種方法計算了渤中凹陷烴源巖的生烴量、排烴量和資源量。盆模法和體積法計算渤中凹陷古近系烴源巖生烴總量分別為494.59億噸和462.4億噸,其中沙三段生烴量最高,分別為184.5億噸和194.8億噸。盆模法和體積法計算的渤中凹陷資源量分別為157.43億噸和115.62億噸,資源潛力巨大,可見渤中凹陷及其周緣今后仍然是渤海石油天然氣勘探的主要領域。綜合多種因素,將渤中凹陷劃分為四個次級洼陷帶,其中,東北次洼為最有利的勘探次洼,兩種方法計算的資源量分別為63.12億噸和40.77億噸;西北次洼最低,分別為17.44億噸和14.53億噸,明確了有利勘探區(qū)。
[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，

本文編號：2404625