华北陆块新区新层页岩气潜在勘探新领域——南华北下寒武统马店组烃源岩及其含气系统  

Exploration Frontiers of Unexplored Shale Layer in New District,North China Block:Source Rock and Its Gas System of Madian Formation of Lower Cambrian in the Southern Part of North China Block(SNCB)

作　　者：陶士振[1] 刘德良[2] 李昌伟[1] 曹高社[1,3] 李振生[1,4] 胡素云[1] 秦胜飞[1] 高晓辉[1] 刘全有[5] 邓国荣[6] 吴向华[6] 李广志[6] 胡斌[6] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国科学技术大学天然气地质资源环境研究中心,安徽合肥230026 [3]河南理工大学资源环境学院,河南焦作454000 [4]合肥工业大学资源环境学院,安徽合肥230009 [5]中国石化勘探开发研究院,北京100083 [6]中国石化资产经营管理有限公司合肥培训测试中心,安徽合肥230022

出　　处：《天然气地球科学》2014年第11期1767-1780,共14页Natural Gas Geoscience

基　　金：国家自然科学基金(编号:40972134;41172117;41372194);中国石油科技项目(编号:2014B-0307;2014B-0608)联合资助

摘　　要：南华北陆块居于兰考—砀山果园场—台儿庄断裂以南至大别造山带北淮阳构造带北部,广泛分布晚震旦世末至早寒武世马店期地层,系一套连续完整的海相自然岩石组合,为海侵沉积层序,自下而上可分4个岩性段：一段为灰黑色砂质页岩;二段为黑灰色含磷砾岩;三段为黑色富磷含金属元素页岩;四段为灰色砂灰岩。马店组有机质属Ⅰ型;有机碳含量为0.68%-26.39%,为好—特好烃源岩;RO值为2%-5%,多为2%-3.5%,尚处于生气高峰期。这里存在第三岩性段干酪根热降解、原油热裂解形成热解、裂解成因页岩气和第二岩性段特别是第四岩性段及其上覆猴家山组形成常规圈闭气藏的现实可能性,即具有烃源岩内非常规页岩气和源外砂灰岩气藏2套含气系统。研究区内存在二次成藏,虽然能够受到多层顺层韧性剪切带糜棱岩纳米级颗粒涂抹的良好保护,但也往往遭到晚期脆性剪切带的条块分割。研究成果及认识对拓展页岩气勘探新区新领域具有一定意义。SNCB is located in south of Lankao-Dangshan Guoyuanchang-Taierzhuang fault and north of Beihuaiyang tectonic belt in Dabie orogeny.The Upper Sinian-Lower Cambrian Madian Formation is widely distributed in SNCB,which is a continuous marine rock association.This sedimentary sequence of transgression can be divided into four lithologic members from bottom to top：gray black arenaceous shale,black gray phosphorus conglomerate,black phosphorus-rich shale that contains metal elements and gray arenaceous limestone.With typeⅠ organic matter and high TOC（0.68%-26.39%）,Madian Formation belongs to good-very good source rock.The ROranges from 2%to 5% with a main distribution in 2%-3.5%,which means the Madian Formation lies in the peak-period of gas generation.Therefore it is possible that shale gas accumulated from the thermal degradation of kerogen or the cracking of crude oil in the third member or conventional gas accumulated in the second member,especially the fourth member and its overlying Houjiashan Formation.Though secondary accumulation can be protected by nanoscale particles smear in the mylonite which formed in multilayer bedded ductile shear zone,they have always been split into bars and block by later brittle shear zone.

关 键 词：华北陆块 下寒武统 马店组 页岩气 气聚集区 

分 类 号：TE132.2[石油与天然气工程—油气勘探]