天然气地球科学 ›› 2022, Vol. 33 ›› Issue (3): 369380.doi: 10.11764/j.issn.1672-1926.2021.10.009
王伟1(),任丽梅2,梁家驹1(),唐松2,袁海锋1,李昱翰2
Wei WANG1(),Limei REN2,Jiaju LIANG1(),Song TANG2,Haifeng YUAN1,Yuhan LI2
摘要:
近几年,随着角探1井、南充1井、潼探1井、高石18井、磨溪42井等在中二叠统茅口组和栖霞组勘探获得高产工业气流,使得川中地区中二叠统成为了天然气勘探的热门层系。研究表明:川中地区中二叠统天然气的供烃层系主要为下古生界和中二叠统自身的烃源岩,天然气大多表现为混源气的特征。当前对于四川盆地下古生界海相烃源岩的研究程度较高,但对于中二叠统海相烃源岩的研究程度较低,因此明确中二叠统海相烃源岩的展布及生烃潜力成了当下亟待解决的问题。为了精细刻画川中地区中二叠统海相碳酸盐岩烃源岩的特征及生烃潜力,分别从烃源岩地球化学特征、烃源岩测井响应特征、以及烃源岩展布特征进行详细描述,在此基础上对川中地区中二叠统海相烃源岩的生烃潜力进行了系统评价。结果表明:①川中地区中二叠统海相烃源岩主要为差—中等品质烃源岩,茅口组烃源岩品质要优于栖霞组;烃源岩有机质类型主要为Ⅱ1型,其次为Ⅱ2型,均处于过成熟阶段;②川中地区中二叠统沉积时为具有一定盐度的还原性沉积水体环境;③烃源岩总有机碳(TOC)测井响应特征明确,TOC含量与自然伽马(GR)和声波时差(AC)相关性最好,可以据此针对川中地区中二叠统开展TOC预测;④纵向上,烃源岩主要发育在栖霞组中下部(栖一段)和茅口组中下部(茅一段—茅二c亚段);横向上,呈现出向北东方向逐渐增厚的特征;⑤川中地区茅口组生烃强度优于栖霞组,主要介于(10 ~50)×108 m3/km2之间,由南西向北东方向逐渐增高,茅口组总生烃量为57.38×1012 m3。
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