【作者】 张润合； 斯春松； 黄羚； 马立桥； 包建平； 王鹏万； 鲁慧丽； 刘玲利； 蒋兴超；

【Author】 ZHANG Runhe;SI Chunsong;HUANG Ling;MA Liqiao;BAO Jianping;WANG Pengwan;LU Huili;LIU Lingli;JIANG Xingchao;Hangzhou Research Institute of Geology,Petro China;Changjiang University;

【机构】 中国石油杭州地质研究院； 长江大学；

【摘要】 凯里古油藏储层沥青有热解和氧化两种成因。热解沥青成熟度较高,沥青反射率在1.41%～1.42%之间,不发荧光;氧化沥青成熟度低,沥青反射率在0.51%～0.52%之间,沥青及包裹体发黄绿色荧光。氧化沥青红外光谱上脂族基团的吸收峰强度大,含氧基团吸收峰较明显,萜烷组成以较高丰度的长链三环萜系列和低丰度的霍烷系列为特征,甾烷系列中含有相对丰富的孕甾烷,表明经历了严重的生物降解。古油藏的油源主要来自下寒武统烃源岩,经历4期成藏过程。前三期发生在三叠纪,在三叠纪末期深埋过程中热解形成沥青和轻质油气;第四期发生于白垩纪燕山—喜山期构造抬升造成的油气改造调整过程中,油藏抬升至地表遭受氧化和生物降解,形成储层中的氧化沥青。凯里古油藏能残存至今主要得益于较好的构造稳定性、继承性发育的古隆起、较低的热演化程度。继承性古隆起与现今构造宽缓向斜带、宽缓背斜围斜带的叠合区是成藏、保存有利区,是南方海相碳酸盐岩油气勘探的重要方向和领域。更多还原

【Abstract】 There are two kinds of bitumen in Kaili plaeo-oil reservoir.One is pyrolytic bitumen,while another is oxidized bitumen.Pyrolytic bitumen doesn’t fluoresce,having relatively high maturity with Rb at range of 1.41%～1.42%.Oxidized bitumen gives out yellow-green fluorescence,having low maturity with Rb at range of 0.51%-0.52%.These bitumen have high absorption peak of aliphatic series-containing groups and obvious absorption peak of oxygencontaining groups in infrared spectrum.Reservoir bitumen is rich in long chain tricyclene series than hopane series,and also rich in pregnane than normal sterane,indicating that bitumen undergoing serious biodegradation.Bitumen of the plaeo-oil reservoir derived from sources rocks of lower Cambrian Series’.The plaeo-oil reservoir underwent four periods of oil accumulation.The former three periods of accumulation happened in Triassic Period,then the oil formed pyrolytic bitumen and light oil and gas in the prosess of deep burying.The fourth period of accumulation happened in cretaceous period in the prosess of oil re-accumulation due to tectonic uplift in Yanshan-Himalayan period,and the oil formed oxidized bitumen by oxidizing and biodegradation.Parts of oil and gas of Kaili plaeo-oil reservoir remaining until today mainly benefit by better tectonic stability,successional paleo uplift and relative low thermal evolution degree of oil system.The inheritance of the paleo-uplift and the present tectonic broadly oblique belt and the gentle anticlinal oblique zone are the reservoirs,which are important areas and fields for the exploration and exploration of the marine rocks in the South.更多还原