CAJ | 학술논문

利用饱和烃色谱、色-质谱谱图特征及生物标志化合物指标，在沙河街组不同层系烃源岩地化特征差异性对比的基础上，结合原油地化特征，分析了沾化凹陷渤南洼陷已发现油气的成因类型及其分布规律。分析表明，渤南洼陷发育沙三段和沙四段2套有效烃源岩，其中沙四段烃源岩按照地化特征差异又细分为膏盐间和膏盐下烃源岩，三者在伽马蜡烷含量、姥植比和成熟度指标上存在明显差异。油源对比表明，目前已发现的原油存在5种成因类型，且具有一定的分布规律。沙三Ⅰ型和沙三Ⅱ型原油均来源于沙三段烃源岩，但是在成熟度和分布上明显不同，沙三Ⅰ型原油分布在洼陷区的沙三中上亚段，成熟度相对较低；沙三Ⅱ型原油分布层位较深，成熟度较高。沙四Ⅰ型原油分布零星，来源于沙四段膏盐间烃源岩。沙四Ⅱ型原油主要来源于沙四段膏盐下烃源岩，多为自生自储型油藏；混源型油气来源于沙三和沙四段烃源岩。油气分布远离油源中心，多位于断阶带上，断层作用对其分布影响明显。
이용포화경색보、색-질보보도특정급생물표지화합물지표，재사하가조불동층계경원암지화특정차이성대비적기출상，결합원유지화특정，분석료첨화요함발남와함이발현유기적성인류형급기분포규률。분석표명，발남와함발육사삼단화사사단2투유효경원암，기중사사단경원암안조지화특정차이우세분위고염간화고염하경원암，삼자재가마사완함량、모식비화성숙도지표상존재명현차이。유원대비표명，목전이발현적원유존재5충성인류형，차구유일정적분포규률。사삼Ⅰ형화사삼Ⅱ형원유균래원우사삼단경원암，단시재성숙도화분포상명현불동，사삼Ⅰ형원유분포재와함구적사삼중상아단，성숙도상대교저；사삼Ⅱ형원유분포층위교심，성숙도교고。사사Ⅰ형원유분포령성，래원우사사단고염간경원암。사사Ⅱ형원유주요래원우사사단고염하경원암，다위자생자저형유장；혼원형유기래원우사삼화사사단경원암。유기분포원리유원중심，다위우단계대상，단층작용대기분포영향명현。
According to the characteristics of saturated hydrocarbon chromatography, GS/MS and biomarker index, combined with the geochemical features of crude oil, the hydrocarbon genetic types and distribution laws of the Bonan Subsag in the Zhanhua Sag have been analyzed based on the comparison of geochemical features of source rocks from different layers of the Shahejie Formation. The research shows that there are 2 suits of hydrocarbon source rocks in the Bonan Subsag, the 3rd member and the 4th member of the Shahejie Formation. The source rocks in the 4th member of the Shahejie Formation can be further divided into evaporate and sub-evaporate ones. All of the source rocks are obviously different in gammacerane content, Pr/Ph ratio and maturity parameters. Oil source correlation indicates that there are 5 types of oil and they have certain laws in distribution. The crude oils of typesⅠandⅡin the 3rd member of the Shahejie Formation both originate from the source rocks in the 3rd member of the Shahejie Formation;however, they are obviously different in maturity and distribution. The crude oils of typeⅠin the 3rd member of the Shahejie Formation locate in the middle and upper sections of the 3rd member of the Shahejie Formation in the depression, with relatively lower maturity. The crude oils of typeⅡin the 3rd member of the Shahejie Formation locate in deeper formations, with relatively higher maturity. The crude oils of typeⅠin the 4th member of the Shahejie Formation distribute sporadically, and originate from the evaporate source rocks in the 4th member of the Shahejie Formation. The crude oils of typeⅡin the 4th member of the Shahejie Formation come from the sub-evaporate source rocks in the 4th member of the Shahejie Formation, and are mainly self-generated and self-reserved. Mixed oil and gas come from source rocks in both of the 3rd and 4th members, and locate far away from source center influenced by faults, mainly in step-fault zones.