天然气地球科学 ›› 2021, Vol. 32 ›› Issue (2): 248261.doi: 10.11764/j.issn.1672-1926.2020.11.020
张成林1(),赵圣贤1,张鉴1,2,常程1,夏自强1,曹埒焰1,田冲1,冯江荣1,方圆1,周翊3
Cheng-lin ZHANG1(),Sheng-xian ZHAO1,Jian ZHANG1,2,Cheng CHANG1,Zi-qiang XIA1,Lie-yan CAO1,Chong TIAN1,Jiang-Rong FENG1,Yuan FANG1,Yi ZHOU3
摘要:
近年来,川南地区上奥陶统五峰组—下志留统龙马溪组页岩气勘探开发逐步向深层领域(埋深3 500~4 500 m)拓展。已在LZ、DZ 2个深层区块取得初步进展,且页岩气勘探开发效果表现不同(前者明显优于后者),其主要与富集条件差异有关。以LZ和DZ区块五峰组—龙马溪组为研究对象,综合利用最新的钻井、录井、测井、地震及分析化验等资料,明确了2个区块富集条件特征、差异性及主控因素。研究表明:①LZ区块在五峰组—龙一1亚段地层厚度、有机质丰度、物性特征、含气性、页岩储层厚度及品质等页岩气富集要素方面均优于DZ区块;②LZ区块在五峰组—龙马溪组形成时期始终位于川南地区深水陆棚相沉积中心,古沉积环境优于DZ区块,古沉积环境的不同造成了2个区块有机质富集和储层规模(厚度、品质)的差异;③DZ区块保存条件明显受断层—天然裂缝系统控制,而LZ区块页岩气的逸散受断层—天然裂缝系统影响较小,压力系数为川南地区最高,保存条件更优。综合研究认为,川南地区LZ、DZ 2个深层区块页岩气富集差异性的主控因素为古沉积环境和后期保存条件;在川南地区深层页岩气勘探开发中应秉持“深层领域找深水沉积页岩储层”的理念,华蓥山断裂带南段南侧的断背斜间发育的多个较宽缓向斜构造应是下步深层页岩气勘探的潜在有利区,LZ区块龙一14小层地质条件优越、具备双层立体开发可行性。
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