珠江口盆地白云南凹ZHSB6层序沉积体系研究
发布时间:2018-07-01 16:01
本文选题:白云凹陷 + 合成地震记录 ; 参考:《成都理工大学》2016年硕士论文
【摘要】:白云凹陷位于南海北部陆坡深水区,属于珠江口盆地珠二坳陷。本文研究区位于白云凹陷南部,面积约为4000km2,研究目的层ZHSB6层序位于珠海组地层的上部。在ZHSB6、ZHSB5层序界面解释的基础上,加密到1×1网格并反复修善解释界面,并提取SQ6内部均方根振幅属性。通过工区内5口井的数据结合波形分析,工区内砂体主要分为三类:Ⅰ类砂岩(砂岩速度小于泥岩速度),Ⅰ类砂岩为分选和磨圆非常好、不含杂基等孔隙充填物的干净砂岩,如河道、河口坝、席状砂、水道砂等,是深水油气勘探中良好的油气储集体,是本次论文研究的重点砂体;Ⅱ类砂岩(砂岩速度与泥岩速度基本相同);Ⅲ类砂岩(砂岩速度大于泥岩速度)。对工区内五口井进行人工合成记录的制作,并通过波形分析、速度分析进行调整,使人工合成地震记录与井旁地震记录道德振幅与波形相匹配,制作岩性柱状图。结合测井数据,GR曲线制作沉积相综合柱状图,使岩性、物性可以明显的显示。单井沉积相分析结果为:W18井在SB21界面之上时,岩性主要为混积陆棚亚相泥质灰岩、泥岩,地震剖面上表现为低频宽缓的弱振幅。SB23.8界面与ZHSB6界面之间的井段,岩性主要为泥岩、粗砂岩、细砂岩和泥质粉砂岩,砂岩砂质较为纯净,向下泥质含量减少。W13-2井岩性以泥岩为主,夹有少量泥质粉砂岩、粉砂质泥岩薄层。主要沉积环境为外陆棚亚相、水动力条件稳定、沉积物质供应匮乏环境沉积,在地震剖面上表现为低频宽缓弱振幅的特征。结合地震线描、波形分析和单井沉积相分析成果有效的将地震相转化为沉积相,分析古水流方向。ZHSB6层序内部发育2支主水流体系,物源方向为北西-南东向。W35井岩性主要为泥岩并夹有薄层粉砂质泥岩,泥岩整体较纯净,在MFS18.5界面附近砂质增加。GR值较高,为三角洲前缘亚相环境沉积。在地震剖面上显示为低频弱振幅特征。W16位于研究区域中部。SB21界面与SB23.8界面之间,岩性主要为泥岩。GR曲线为指形,为水动力条件稳定、沉积物质供应匮乏的外陆棚亚相环境沉积。在地震剖面上呈现为低频宽缓弱振幅特征。对ZHSB6层序进行均方根振幅属性提取,结合波形分析,对均方根属性上不同颜色进行分析,对砂体进行圈定,通过砂体扩边解释,分析沉积体系,较好地展示沉积体内骨架地层分布及其平面分布形态。层序内部形成了的三角洲平原-三角洲前缘海陆交互相-斜坡扇的沉积环境。
[Abstract]:Baiyun Sag is located in the deep water area on the northern slope of the South China Sea and belongs to the Pearl River mouth Basin. The study area of this paper is located in the south of Baiyun Sag with an area of about 4000km2. The ZHSB6 sequence of the target layer is located in the upper part of the Zhuhai formation. Based on the interpretation of ZHSB6 / ZHSB5 sequence interface, 1 脳 1 mesh is encrypted and the interpretation interface is modified repeatedly, and the amplitude attribute of root mean square inside SQ6 is extracted. Based on the data of 5 wells in the working area and waveform analysis, the sand bodies in the working area are mainly divided into three types: type I sandstone (sandstone velocity is less than mudstone velocity), type I sandstone is clean sandstone with very good sorting and grinding circle, and no pore filling such as complex base. Such as river channel, estuarine dam, sheet sand, channel sand and so on, are good oil and gas reservoirs in deepwater oil and gas exploration, and are the key sand bodies in this paper. Type 鈪,
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