华北地区东部下古生界烃源岩特征及其影响因素

华北地区下古生界烃源岩研究对前古近系油气战略资源选区具有重要意义。从沉积学角度出发,通过对研究区有机碳含量、生烃潜力和氯仿沥青“A”等参数的统计分析和平面制图,划分了烃源岩类型,并对影响烃源岩发育因素进行分析。研究认为:华北东部奥陶系上、下马家沟组及峰峰组为较好的烃源岩。影响烃源岩发育的必要因素是海洋生物生产力,影响烃源岩发育的主要因素包括古气候、古沉积环境、古构造及沉积作用。此成果可以为华北东部油气资源战略选区提供有效的地质依据。

Distribution character and influential factor of hydrocarbon source rock of lower-Palaeozoic in the east of North China

Study on the hydrocarbon source rocks of Lower- Palaeozoic in North China is very important to the Pre- Tertiary oil-gas strategic precinct.From the point of view of sedimentology,the types,quality evaluation and genesis in the study area are analyzed according to the sta- tistics of parameters of TOC(%),hydrocarbon genera- tion potential and chloroform bitumen'A'.The results in- dicate that preferable hydrocarbon source rocks are found to be existed in the Lower-Majiagou formation,the Up- per-Majiagou formation and the Fengfeng formation of Ordovician.The necessary factor of the source rock devel- opment is the productivity of marine organisms,while the main factors are paleoclimate,palaeosedimentary environ- ment,palaeostructure and sedimentary process.These re- sults can provide a lot of effective geological information for the Pre-Tertiary oil-gas strategic precinct in the East of North China.