潍北凹陷原油成因类型分布及油源对比

Oil genetic classification and oil-source correlation in Weibei Depression

史翠娥 杨慧臣 尚刚 王传忠 席伟军

中国石化胜利油田分公司东胜公司，山东 东营 257001 中国石化胜利油田分公司新春采油厂，山东 东营 257001

Dongsheng Company, Shengli Oilfield Company, SINOPEC, Dongying 257001, China Xinchun Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257001, China)

应用油藏地球化学方法对潍北凹陷孔店组原油进行成因类型划分和油源对比研究，通过生物标志化合物特征分析，可将潍北凹陷原油分为4类，Ⅰ类为成熟腐殖型原油、Ⅱ类为低熟腐殖型原油、Ⅲ类为成熟腐泥型原油、Ⅳ类为低成熟腐泥型原油；Ⅰ类和Ⅲ类原油在工区分布广泛，Ⅱ类和Ⅳ类原油主要分布在东南部。通过油源对比研究，认为Ⅰ类、Ⅱ类原油主要来源于临近区域的孔二段上亚段湖沼相的泥岩或碳质泥岩，Ⅲ类、Ⅳ类原油主要来源于临近区域的孔二段中亚段的湖相泥岩。

Using the reservoir geochemistry method， this paper mainly studies the genetic classification and oil-source correlation in Weibei Depression. Through analyzing the compound features of biomarker, the crude oils in Weibei Depression can be divided into four types: Type Ⅰ is mature humic oil, TypeⅡis low-mature humic oil, Type Ⅲ is mature sapropel oil and Type Ⅳ is low-mature sapropel oil. TypeⅠand Ⅲ crude oil are widely distributed in the study area. The crude oils of TypeⅡ and Ⅳ are mainly distributed in the southeast. From oil-source correlation analysis, it ia considered that the crude oils of TypeⅠand Ⅱ come mainly from the area adjacent to the mudstone of lakes-swamps or carbonaceous mudstone Ek2s and Type Ⅲ and Ⅳ crude oils mainly come from the lacustrine mudstones of Ek2z.

10.6056/dkyqt201306007