摘要
针对东海陆架盆地西湖凹陷渐新统花港组河流-三角洲相储集层横向变化快、常规切片属性形态差、储集层预测难度大、难以满足岩性油气藏的后续勘探开发的问题应用分频解释、反演-常规-90°相移联合构建地震岩性体、非线性切片、古地貌恢复、多属性融合等特色技术对传统地震沉积学方法进行优化。研究发现花港组发育辫状河、曲流河和浅水三角洲3类沉积体,垂向沉积演化受中期基准面旋回和古地貌联合控制。在中期基准面旋回上升阶段的早—中期以辫状河道沉积为主,发育垂向叠置型砂体;在上升半旋回晚期和下降半旋回的早期以曲流河沉积为主,发育孤立型砂体;在中期基准面下降半旋回的中—晚期以浅水三角洲沉积为主,发育迁移型中—厚层砂体。限定性古地貌对砂体展布具有控制作用,非限定性古地貌对砂体展布影响较小。在储集层刻画的基础上,提出断层封堵型和储集层上倾尖灭型构造岩性圈闭是西湖凹陷下一步滚动挖潜的主力方向。
The fluvial-deltaic reservoirs of the Oligocene Huagang Formation in the Xihu sag of the East China Sea shelf basin reflect rapid lateral change in sedimentary facies and poor morphology of conventional slice attributes, which bring difficulties to the reservoir prediction for subsequent exploration and development of lithologic reservoirs. The traditional seismic sedimentology technology is optimized by applying the characteristic technologies such as frequency-boosting interpretation, inversion-conventional-–90° phase shift joint construction of seismic lithologic bodies, nonlinear slices, paleogeomorphology restoration, and multi-attribute fusion, to obtain typical slice attributes, which are conducive to geological form description and sedimentary interpretation. The Huagang Formation developed three types of sedimentary bodies: braided river, meandering river and shallow water delta, and the vertical sedimentary evolution was controlled by the mid-term base-level cycle and paleogeomorphology. In the early–middle stage of the mid-term base-level ascending cycle, braided channel deposits were dominant, and vertical superimposed sand bodies were developed. In the late stage of the ascending half-cycle and the early stage of the descending half-cycle, meandering river deposits were dominant, and isolated sand bodies were developed. In the middle–late stage of the descending half-cycle, shallow-water delta deposits were dominant, and migratory medium–thick sand bodies were developed. Restricted paleogeomorphology controlled the sand body distribution, while non-restricted paleogeomorphology had little effect on the sand body distribution. Based on reservoir characterization, the fault sealing type and reservoir updip pinch-out type structural lithological traps are proposed as the main directions for future exploration and development in the Xihu sag.
作者
娄敏
蔡华
何贤科
刘英辉
黄鑫
张宪国
刘华峰
LOU Min;CAI Hua;HE Xianke;LIU Yinghui;HUANG Xin;ZHANG Xianguo;LIU Huafeng(Shanghai Branch of CNOOC,Shanghai 200335,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;China University of Petroleum(East China),Qingdao 266580,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2023年第1期125-138,共14页
Petroleum Exploration and Development
基金
国家科技重大专项“东海厚层非均质性大型气田有效开发关键技术”(2016ZX05027-004)
中海石油(中国)有限公司重大科技专项“西湖凹陷在生产油气田中后期综合调整关键技术研究与实践”(CNOOC-KJ 135,ZDXM 39 SH03)。
关键词
东海陆架盆地
西湖凹陷
渐新统花港组
河流-三角洲相
储集层刻画
地震沉积学
East China Sea shelf basin
Xihu sag
Oligocene Huagang Formation
fluvial-deltaic facies
reservoir characterization
seismic sedimentology
作者简介
第一作者:娄敏(1993-),男,湖北汉川人,硕士,中海石油(中国)有限公司上海分公司工程师,主要从事开发地质及开发地震研究。地址:上海市长宁区通协陆388号中海油大厦A座540室,邮政编码:200335。E-mail:loumin2@cnooc.com.cn。
