吉林大学学报(地球科学版)
吉林大學學報(地毬科學版)
길림대학학보(지구과학판)
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
1期
56-66
,共11页
吴红烛%黄志龙%杨柏松%柳波%闫玉魁%桑廷义%川江
吳紅燭%黃誌龍%楊柏鬆%柳波%閆玉魁%桑廷義%川江
오홍충%황지룡%양백송%류파%염옥괴%상정의%천강
低熟油%页岩油%主生烃带%富氢无定形体%地球化学
低熟油%頁巖油%主生烴帶%富氫無定形體%地毬化學
저숙유%혈암유%주생경대%부경무정형체%지구화학
low-mature oil%shale oil%main hydrocarbon-generating zone%hydrogen-rich amorphous solid%geochemistry
勘探实践和研究表明,马朗凹陷二叠系芦草沟组源内油气为页岩油,该原油C29甾烷立体异构化参数 w(20S)/w(20S+20R)、w(ββ)/w(αα+ββ)均为0.2~0.4,为典型低熟原油。通过对芦草沟组烃源岩地球化学和有机岩石学特征的综合研究,发现低熟页岩油的生烃母质为原生的富氢无定形体,这些无定形体在沉积早期经历过细菌的改造作用,致使其具有特殊的生烃演化模式,即低熟成熟阶段早期( Ro 为0.55%~0.75%)处于生油高峰,对应埋深为1800~2900 m ,埋深大于或小于该主峰带,烃源岩生烃能力急剧降低。泥岩生烃模拟实验、热解、抽提等实验数据表明:芦草沟组低熟页岩油正是位于该主生带的源岩所生,处于生烃带的源岩区即为马朗凹陷低熟页岩油富集的有利地区。
勘探實踐和研究錶明,馬朗凹陷二疊繫蘆草溝組源內油氣為頁巖油,該原油C29甾烷立體異構化參數 w(20S)/w(20S+20R)、w(ββ)/w(αα+ββ)均為0.2~0.4,為典型低熟原油。通過對蘆草溝組烴源巖地毬化學和有機巖石學特徵的綜閤研究,髮現低熟頁巖油的生烴母質為原生的富氫無定形體,這些無定形體在沉積早期經歷過細菌的改造作用,緻使其具有特殊的生烴縯化模式,即低熟成熟階段早期( Ro 為0.55%~0.75%)處于生油高峰,對應埋深為1800~2900 m ,埋深大于或小于該主峰帶,烴源巖生烴能力急劇降低。泥巖生烴模擬實驗、熱解、抽提等實驗數據錶明:蘆草溝組低熟頁巖油正是位于該主生帶的源巖所生,處于生烴帶的源巖區即為馬朗凹陷低熟頁巖油富集的有利地區。
감탐실천화연구표명,마랑요함이첩계호초구조원내유기위혈암유,해원유C29치완입체이구화삼수 w(20S)/w(20S+20R)、w(ββ)/w(αα+ββ)균위0.2~0.4,위전형저숙원유。통과대호초구조경원암지구화학화유궤암석학특정적종합연구,발현저숙혈암유적생경모질위원생적부경무정형체,저사무정형체재침적조기경력과세균적개조작용,치사기구유특수적생경연화모식,즉저숙성숙계단조기( Ro 위0.55%~0.75%)처우생유고봉,대응매심위1800~2900 m ,매심대우혹소우해주봉대,경원암생경능력급극강저。니암생경모의실험、열해、추제등실험수거표명:호초구조저숙혈암유정시위우해주생대적원암소생,처우생경대적원암구즉위마랑요함저숙혈암유부집적유리지구。
Exploration practices and researches show that hydrocarbon in the source rocks of the Lucaogou Formation of the Permian ,Malang sag was shale oil and also a typical low-mature oil with both sterane isomerization parameters (20S/(20S + 20R) and ββ/(αα + ββ)) between 0 .2 and 0 .4 . Through comprehensive study of geochemical and organic petrology characteristics in the hydrocarbon source rock of Lucaogou Formation ,we find that the parent material of this low-mature shale oil was hydrogen-rich amorphous solid and experienced the bacteria transformation in the early sedimentary stage , w hich resulted in the formation of the particular hydrocarbon-generating evolution model . Namely ,during the low-mature and early mature stage with Ro values 0 .55% 0 .75% ,there is an oil generation peak w hose burial depth ranges from 1 800 to 2 900 m , and the hydrocarbon-generating potential of source rock drops sharply beyond the main hydrocarbon-generating zone . The results of hydrocarbon-generating simulation experiments , rock pyrolysis analysis and organic extraction of mudstone prove that the low-mature shale oil in Lucaogou Formation was generated by the hydrocarbon source rocks within the range of main hydrocarbon-generating zone ,where was the beneficial places of shale oil accumulation .