低勘探区烃源岩SAS预测技术——以陆丰凹陷海丰33洼文昌组为例  

Prediction of source rock based on SAS in an immature exploration area:a case study of Wenchang formation in the Haifeng 33 sag,Lufeng depression

作　　者：汪旭东 林鹤鸣 邱欣卫 李敏 吴琼玲 肖张波 WANG XuDong;LIN HeMing;QIU XinWei;LI Min;WU QiongLing;XIAO ZhangBo(Research Institute of CNOOC China Limited,Shenzhen Branch,Shenzhen 518000,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,深圳518000

出　　处：《地球物理学进展》2022年第2期882-891,共10页Progress in Geophysics

基　　金：国家科技重大专项“南海东部海域勘探新领域及关键技术”(2016ZX05024-004);中国海油科技重点项目“南海东部油田上产2000万吨关键技术研究”(CNOOC-KJ135ZDXM37SZ)联合资助.

摘　　要：烃源岩预测是无井低勘探区早期评价的关键.本文对比钻井已证实富烃陆丰南各洼陷,利用低勘探区烃源岩SAS预测技术在海丰33洼开展烃源岩预测.首先在钻井已证实富烃洼陷,计算烃源岩发育层系的洼陷总沉降量,求取最小值作为可发育深湖-半深湖环境总沉降量的下限,并总结发育深湖-半深湖烃源岩地层的地震相,建立深湖-半深湖烃源岩地震相识别标准.然后在低勘探区,计算洼陷总沉降量,寻找潜在可发育深湖-半深湖的洼陷.其次,在潜在可发育深湖-半深湖的洼陷,依据洼陷可容空间与沉积物供给关系寻找发育深湖-半深湖泥岩的洼陷.最后综合考虑湖盆类型,结合深湖-半深湖相烃源岩地震相识别标准,预测烃源岩空间展布.Source rock prediction is the key to early evaluation of an immature exploration area without well drilling.Compared with hydrocarbon-rich sags of the southern Lufeng depression,the prediction of source rock prediction based on SAS was carried out in Haifeng 33 sag.Firstly,the total subsidence of the hydrocarbonrich sags was calculated to determine the minimum value which can be used to identify the semi-deep and deep lacustrine facies and the seismic facies of semi-deep and deep lacustrine source rocks were summarized in the mature exploration spaces.Secondly,the total subsidence was figured out to hunt the potential seim-deep and deep lacustrine sag in the immature exploration area.Thirdly,the seimdeep and deep lacustrine shale sag was determined according to the ratio of the accommodation and sediment supply.Finally,the distribution of source rocks can be predicted by the lake type and the seismic facies of the seim-deep and deep lacustrine source rocks.

关 键 词：低勘探区 烃源岩 SAS技术 海丰33洼 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]