摘要
南海琼东南盆地中央峡谷深水L气田开发成本和风险高,需要精确落实探明地质储量,降低气田开发风险。然而,A井、B井对水道壁的标定结果不一致,影响砂体边界和储量落实。为此,基于多种资料,推测峡谷水道壁沉积演化过程,并通过三种模式的水道壁正演模拟,确定其地震响应特征,最后结合实际资料证实其合理性。研究结果表明,中央峡谷水道壁内、外两套不同的地层压力系统间存在一套相对高速度、高密度、高电阻率、高自然伽马的压力分隔层,分隔层顶部为峡谷水道壁,分隔层底部为地层压力分界线,两者分别对应地震波峰和波谷响应。深水中央峡谷水道壁和地层压力分界线地震响应特征的确定,有利于该区天然气探明地质储量的落实和今后钻前地层压力急剧变化点的有效预测。
With high cost and risk of developing the L gas field in the deep-water central valley in the Qiongdongnan Basin,it is necessary to precisely prove the geological reserves of the gas field.However,the calibrated results from wells A and B to the channel wall are completely opposite,and affect the defination of the structure boundary and the reserves.Based on a variety of data,we studied the sedimentary evolution of the canyon channel wall,determined its seismic response characteristics through forward simulation on three models,and finally confirmed its rationality on field data.The results show that there is a pressure isolating layer with high velocity,high density,high resistivity and high gamma between two different formation pressure systems inside and outside the central canyon channel wall.The top of the isolating layer is the canyon channel wall,and the bottom of the isolating layer is the formation pressure boundary.They are,respectively,the responses of seismic crest and trough.The determination of seismic response characteristics of the channel wall and the formation pressure boundary in the South China Sea is conducive to proving the geological reserves of natural gas and effectively predicting key points of formation pressure before drilling operation in the future.
作者
廖仪
刘巍
马光克
邓海东
李雷
LIAO Yi;LIU Wei;MA Guangke;DENG Haidong;LI Lei(Hainan Branch of CNOOC Ltd,Haikou,Hainan 524057,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2021年第2期332-339,355,I0011,共10页
Oil Geophysical Prospecting
关键词
中央峡谷
水道壁
压力预测
正演模拟
压力分隔层
central canyon
channel wall
pressure prediction
forward modeling
pressure isolating layer
作者简介
廖仪,工程师,1986年生,2010年获河北地质大学地球信息科学与技术专业学士学位,2014年获中国海洋大学地球探测与信息技术专业硕士学位,现就职于中海石油(中国)有限公司海南分公司南海西部石油研究院开发地震室,主要从事深水气田开发地球物理研究。海南省海口市秀英区西海岸御府国际中海石油(中国)海南分公司南海西部石油研究院,524057。Email:liaoyi2@cnooc.com.cn。
