岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 4655.doi: 10.12108/yxyqc.20240505
程焱, 王波, 张铜耀, 齐玉民, 杨纪磊, 郝鹏, 李阔, 王晓东
CHENG Yan, WANG Bo, ZHANG Tongyao, QI Yumin, YANG Jilei, HAO Peng, LI Kuo, WANG Xiaodong
摘要: 通过烃源岩特征分析及典型井原油样品的生物标志化合物参数对比,对渤中凹陷西南环带渤中A-2区新近系明下段岩性油气藏的原油来源及其运聚规律进行了研究。研究结果表明:①渤中凹陷西南环带纵向发育东三段、沙一段及沙三段等层段烃源岩,东三段烃源岩具C19TT优势,Ts丰度值较大,C27-C28-C29规则甾烷呈“V”形分布;沙一段烃源岩具C23TT优势,Ts与Tm丰度值相近,γ蜡烷丰度值大,C27-C28-C29规则甾烷呈“L”形分布;沙三段烃源岩具C21TT或C23TT优势,Ts丰度值较大,C27-C28-C29规则甾烷呈“V”形分布,具C27优势。②原油物性参数及气相色谱图差异性分析结果显示,渤中A-2油藏东南井区原油充注能力强于中部井区,C27-C28-C29规则甾烷整体呈“L”形分布,4-甲基甾烷峰值较大。明下段上部原油C19TT/C23TT的值较小,MPI1和MPI2参数均较大,全油碳同位素稍重,显示其油源以沙一段供烃为主、沙三段供烃为辅。③渤中A-2油藏各井的1-甲基菲、9-甲基菲、C29ααS(/S+R),C29ββ/(αα+ββ)、二苯并噻吩系列、QGF指数等参数均呈规律性变化,指示了原油运移路径为经东南向西北运移聚集成藏。原油生物标志化合物对比结果显示,渤中凹陷西南环带深部原油先汇聚至渤中A-4油藏馆陶组,再通过垂向输导至浅层明下段,然后沿横向广覆砂体运移至渤中A-2油藏明下段,从而形成了现今的岩性油气藏。
中图分类号:
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