Estimation of Paleogene Wenchang Formation Resources and Exploration Direction in AB Depression,Pearl River Mouth Basin
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摘要: AB凹陷是珠江口盆地主要油气产区之一,对其进行烃源岩特征和油气资源量的研究具有重要意义。文昌组烃源岩厚度大且分布面积广,有机质类型以Ⅰ-Ⅱ1型为主,有机质丰度平均2.27%,主要发育于SQ1-SQ6层序中深湖亚相中。研究区内地球化学资料相对较少,通过对比邻区以及综合相关资料,运用成因法,以三级层序为基本单位,对研究区4个次洼(A1、A2、A3、A4洼)进行了文昌组生烃量以及资源量的估算。研究结果表明:A1洼油气资源量为1.007×108t,A2洼为1.343×108t,A3洼为2.545×108t,A4洼为1.705×108t。其中A3洼最有利,A4洼次之,A2洼再次之,A1洼最小。研究区存在2种圈闭:上倾尖灭岩性圈闭和透镜状岩性圈闭,具有油气就近聚集的特点,大型的油气藏分布于AB凹陷中北部,因此AB凹陷中北部为有利勘探区块。Abstract: AB Depression is one of the major petroleum contribution areas in Peal River Mouth Basin,and it is significant to the research of source rock characteristics and petroleum resources.Source rocks of Wenchang Formation have large thickness and wide distribution area,with Ⅰ-Ⅱ1 organic matter which reaches 2.27% on average and develops in middle-deep lacustrine facies.There are relatively few geochemical data in AB Depression.The third sequence as the basic unit goes on estimating quantity of hydrocarbon generation and quantity of resources of Wenchang Formation for the four sub-sags which are the A1,A2,A3 and A4,with the next area and comprehensive information.Resources of the four sub-sags are 1.007×108,1.343×108,2.545×108 t and 1.705×108 t respectively.Estimation result shows that A3sub-sag is the most favorable,A4sub-sag followed,A2sub-sag of again,A1sub-sag is minimal.The research area has updip pinch-out and lenticular trap.Because of the feature of oil and gas which has gathered nearby,the big oil and gas reservoir is located in north central of AB Depression.
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