东濮凹陷古近系致密砂岩气成因与充注差异

发布时间：2018-04-28 03:08

本文选题：致密砂岩 + 天然气成因　；参考：《石油学报》2017年09期

【摘要】：中国东部深层古近系致密砂岩气是今后油气勘探的重要接替领域。以东濮凹陷深层古近系致密砂岩气为例,根据天然气组分、碳同位素及储层沥青等分析了天然气成因,从储层致密化及油气充注期等方面,研究了深层洼陷带、斜坡带致密砂岩气充注差异,并划分了气藏成因类型。结果表明,东濮凹陷洼陷带以腐泥型干酪根裂解气为主,并混有原油裂解气,储层在东营组沉积期和明化镇组沉积中期均演化为致密储层,普遍存在东营组沉积中后期—东营组抬升初期、明化镇组沉积后期—第四纪2期油气充注;东濮凹陷斜坡带以原油裂解气为主,储层在明化镇组沉积中期演化为致密储层,以东营组沉积中后期—东营组抬升初期油气充注为主。根据天然气成因、储层致密化进程及其与油气充注期的关系,将东濮凹陷深层古近系致密砂岩气藏划分为2种成因类型:洼陷带2期致密混合型气藏,斜坡带晚期致密原油裂解型气藏。
[Abstract]:Deep Paleogene tight sandstone gas in eastern China is an important replacement for oil and gas exploration in the future. The deep Paleogene tight sandstone gas in Dongpu depression is taken as an example. According to the natural gas composition, carbon isotope and reservoir asphalt, the origin of natural gas is analyzed, and the deep depression zone is studied from the aspects of reservoir densification and oil and gas filling period, etc. The gas filling difference of tight sandstone in the slope zone is different, and the genetic types of gas reservoirs are divided. The results show that the sag zone in Dongpu depression is dominated by saprophyte kerogen cracking gas and mixed with crude oil cracking gas. The reservoir evolved into a dense reservoir during the sedimentary period of Dongying formation and the middle sedimentary period of Minghuazhen formation. In the middle and late sedimentary period of Dongying formation to the early stage of Dongying formation uplift, the late sedimentary period of Minghuazhen formation and the second period of Quaternary period oil and gas charging, the slope zone of Dongpu depression is dominated by crude oil cracking gas, and the reservoir evolves into a compact reservoir in the middle sedimentary period of Minghuazhen formation. The main oil and gas injection is Dongying formation in the middle and late sedimentary period to the early uplift stage of Dongying formation. According to the origin of natural gas, the process of reservoir densification and its relationship with the filling period of oil and gas, the deep Paleogene tight sandstone gas reservoir in Dongpu depression is divided into two genetic types: the second stage tight mixed gas reservoir in sag zone. Slope zone late tight crude oil pyrolysis gas reservoir.
【作者单位】：中国石油大学地球科学与技术学院;中国石油化工股份有限公司中原油田分公司勘探开发研究院;
【基金】：国家重大科技专项(2016ZX05006-007)资助
【分类号】：P618.13

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