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琼东南盆地深水区陵水17-2大气田成藏机理
引用本文:张功成,曾清波,苏龙,杨海长,陈莹,杨东升,纪沫,吕成福,孙钰皓.琼东南盆地深水区陵水17-2大气田成藏机理[J].石油学报,2016,37(Z1):34-46.
作者姓名:张功成  曾清波  苏龙  杨海长  陈莹  杨东升  纪沫  吕成福  孙钰皓
作者单位:1. 中海油研究总院 北京 100028; 2. 中国科学院油气资源研究重点实验室 中国科学院地质与地球物理研究所兰州油气资源研究中心 甘肃兰州 730000
基金项目:国家重大科技专项(2008ZX05025、2011ZX05025、2016ZX05026)、国家重点基础研究发展计划(973)项目(2009CB219400)、国土资源部全国油气资源战略选区调查评价项目(XQ2004-05)和南海北部陆坡深水海域油气资源战略调查及评价项目(XQ2007-05)资助。
摘    要:陵水17-2大气田位于琼东南盆地陵水凹陷深水区。该凹陷是继承性深大凹陷,面积达5 000 km2,新生界最大厚度达13 km。凹陷内发育始新统、下渐新统崖城组、上渐新统陵水组3套烃源岩,其中崖城组是主力烃源岩,包括煤系和海相泥岩。陵水凹陷是高温凹陷,崖城组烃源岩底部温度可达250℃以上,烃源岩镜煤反射率可达2%~5%。开放和封闭体系的高温生烃模拟实验显示,该套烃源岩生气下限Ro值可达4.38%以上,约为4.4%,因此崖城组主体处在生气窗内,资源量近万亿立方米,是富生烃凹陷。莺歌海组-黄流组是陵水凹陷首选勘探目的层,储层主要发育于中央峡谷水道内。该峡谷长约425 km、宽度3~25 km、深度270~700 m,平行于陆坡近东西走向。峡谷水道内共充填了5期次级水道,发育轴部砂、侧向加积砂、天然堤和侵蚀残余砂4类储集体,物性极好,并形成岩性或构造-岩性圈闭。陵水凹陷北部边缘和南部边缘发育两个串珠状分布的底辟带,类型为泥-流体底辟,南部底辟带沟通了深层崖城组烃源岩与浅层峡谷水道砂岩,崖城组生成的天然气垂向运移至水道砂体,再在水道储层内发生侧向运移,呈T型运移模型,在圈闭内形成天然气田。

关 键 词:烃源岩  生烃极限  中央峡谷水道  底辟  陵水凹陷  深水区  
收稿时间:2015-12-04
修稿时间:2016-09-10

Accumulation mechanism of LS 17-2 deep water giant gas field in Qiongdongnan Basin
Zhang Gongcheng,Zeng Qingbo,Su Long,Yang Haizhang,Chen Ying,Yang Dongsheng,Ji Mo,L&#,Chengfu,Sun Yuhao.Accumulation mechanism of LS 17-2 deep water giant gas field in Qiongdongnan Basin[J].Acta Petrolei Sinica,2016,37(Z1):34-46.
Authors:Zhang Gongcheng  Zeng Qingbo  Su Long  Yang Haizhang  Chen Ying  Yang Dongsheng  Ji Mo  L&#  Chengfu  Sun Yuhao
Affiliation:1. CNOOC Research Institute, Beijing 100028, China; 2. Key Laboratory of Petroleum Resources Research, Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Gansu Lanzhou 730000, China
Abstract:LS 17-2 giant gas field is located in the deep water area of Lingshui sag of Qiongdongnan Basin. The sag is a successive large and deep sag covering an area of 5 000 km2 with the maximum Cenozoic strata thickness of 13 km. Three sets of source rocks are developed in the sag, i.e., Eocene and lower Oligocene Yacheng Formation as well as upper Oligocene Lingshui Formation, and Yacheng Formation is the main source rock including coal measures and marine mudstone. Lingshui sag is characterized by high temperature. The bottom temperature of source rock in Yacheng Formation can exceed 250℃, and the reflectivity of source rock is up to 2%~5%. The simulation experiments of hydrocarbon generation in open and closed systems at high temperature indicate that the lower limit of gas generation for this set of source rock can reach more than 4.38% (about 4.4%), and thus the main part of Yacheng Formation is in the gas window, whose resource quantity is nearly 1 trillion cubic meters, indicating that it is a prolific hydrocarbon-generation sag. Yinggehai Formation-Huangliu Formatiom is the first exploration target in Lingshui sag, and the main reservoirs are developed in the channel of the central canyon. The canyon is about 425 km long, 3-25 km wide and 270-700 m deep; it is nearly EW-trending and parallel to the continental slope. Five stages of secondary channels were filled in the channel of the canyon where four kinds of reservoirs including axial sand, lateral accretion sand, natural levee as well as erosion-causing residual sand with extremely good physical properties, forming lithologic traps or structural-lithologic traps. There are two moniliform diapir zones on the northern and southern margins of Lingshui sag, and they are mud-fluid diapers. The southern diaper zone communicates source rocks in Yacheng Formation and shallow sandstones in canyon channel. Gas generated from Yacheng Formation migrates vertically to the channel sand body, and then migrates laterally in channel reservoirs showing a T-type migration model, forming a gas field in the trap.
Keywords:source rock  limit of hydrocarbon generation  central canyon channel  diaper  Lingshui sag  deep water area  
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