天然气地球科学 ›› 2021, Vol. 32 ›› Issue (9): 13581371.doi: 10.11764/j.issn.1672-1926.2021.03.013
池鑫琪1,2(),冯强汉3,许淑梅1,2,4(),舒鹏程1,2,孔家豪1,2,崔慧琪1,2,马慧磊1,2
Xinqi CHI1,2(),Qianghan FENG3,Shumei XU1,2,4(),Pengcheng SHU1,2,Jiahao KONG1,2,Huiqi CUI1,2,Huilei MA1,2
摘要:
鄂尔多斯盆地苏里格气田桃2区块下古生界中奥陶统马家沟组五段经历风化岩溶作用,形成以(含)膏云岩为主的风化壳岩溶储层。通过对该区块马五1?4亚段的取心观察,发现其表现出与传统碳酸盐岩风化壳截然不同的岩溶作用特征。通过显微观察分析(含)膏云岩的孔隙发育特征,借助海平面变化识别出不同的沉积旋回,以及基于沉积微相分析研究风化壳储层的相控作用并探讨了相控储层的成因机理。结果表明:研究区马五1?4亚段属于潮坪沉积环境。膏质、白云质和灰质沉积共生发育,形成了5个海平面降低、海水变浅的沉积旋回,自下而上分别为潮下带灰云坪和云灰坪,潮间带云坪和泥云坪,潮上带膏云坪。优质储层发育层位恰好与潮上带膏云坪的发育位置一致,风化壳储层具有明显的相控特征。潮上带(含)膏云岩在岩溶作用过程中形成独特的“小孔微缝”型孔隙结构。储层类型为层状相控岩溶成因地层圈闭气藏,有利微相为潮上带膏云坪,风化壳储层在平面上受(含)膏云岩展布的制约成层分布,层内孔隙分布和物性具有明显的均质性。
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