摘要
黄河口凹陷南斜坡渤中34-9构造区历经30年勘探一直没有获得突破,究其原因,主要是区内岩浆岩分布对下伏地层地震反射能量产生屏蔽作用,导致构造落实程度较低,对岩浆岩发育规律及控藏作用认识不清。通过地震、地质综合研究与岩浆岩三维精细刻画,获得了以下认识及成果:1渤中34-9构造区岩浆岩火山主喷发时间为东营组沉积时期,围区东营组岩浆岩岩性主要为玄武岩;火山活动总体表现为多期喷发、区域式喷发特点,在渐新世晚期喷发强度最大,且主要以夏威夷型火山喷发模式为主;主要由火山通道相、溢流相、爆发相3类亚相组成,其中溢流相分布最为广泛。2方差属性对火山通道相极为敏感,均方根振幅属性对溢流相较为敏感,基于此对火山通道和溢流岩浆的刻画采取了不同的地震数据拾取方式,并通过数据体拼接,实现了研究区岩浆岩火山通道相、溢流相空间展布的三维定量表征。3岩浆岩发育区封盖条件优越,可以联合断层进行侧封;火山通道相岩浆岩会占据一定储层空间,但是借助精细刻画可以规避钻探风险;岩浆岩发育早于主成藏期,不会破坏晚期油气藏。4岩浆岩发育区可能是协助断层封堵、解决南斜坡侧封不利的优势区带,据此提出了靠近岩浆岩布井的思路,从而有效指导了渤中34-9构造区的勘探部署,并首次在渤海海域发现了岩浆岩下的大中型优质油气田。
Few exploration breakthroughs are made in BZ34-9 tectonic region in the southern slope of Huanghekou sag in recent 30 years because the magmatic rocks shield seismic reflection energy of underly- ing formation in the study area, which leads to the uncertainty of structure trap identification and the less understanding of magmatic rocks development pattern and control of reservoir forming. With the compre- hensive research of geophysics, geology and 3D fine description of magmatic rocks, the following under- standings and achievements are generalized： Din BZ34-9 tectonic region, the main volcano eruption stage is during the Dongying Formation sedimentary period and basalt is its main magmatic rock; with the gener-al characteristics of multistage and regional eruption, the volcanic activities become most furious during Late Oligocene with its major eruption model of Hawaii type; BZ34-9 tectonic region mostly develops volcano chan- nel. overflow and explosive subfacies in which overflow subfacies distribute widely. （1）the variance altribute is sensitive to volcano channel subfacies, and the RMS attribute is sensitive to overflow subfacies. So the different seismic picking up patterns to describe the volcano channel subfacies and overflow subfaeies can be chosen, and the data volume is stitched, thus achieving the 3D quantitative characterization. （2） sealing condition in magmatic rocks zone is superior by combining with small faults to side-seal. Magmatic rocks with volcano cbannel subfacies can take over some reservoir spaces, but the drilling risk can be avoided by using fine description. Magmatic rocks development stages occur before major hydrocarbon accumulation, so they don＇t destroy the late reservoirs. （4）magmatic rocks development area may he a favorable zone to solve the side-seal problem in the southern slope of Huanghekou sag. Based on this point, the idea of placing well close to lhe magmatic rocks development zone is proposed, which effectively guides the discovery of a high quality large-medium scale oilfield under the magmatic rocks in BZ34-9 structure.
出处
《中国海上油气》
CAS
CSCD
北大核心
2016年第2期71-77,共7页
China Offshore Oil and Gas
基金
"十二五"国家科技重大专项"大型油气田及煤层气开发(编号:2011ZX05023-002)"部分研究成果
关键词
黄河口凹陷南斜坡
渤中34-9构造区
岩浆岩
三维精细刻画
溢流相
成藏影响
大中型优质油气田
the southern slope of H uanghekou sag
BZ.34-9 structure
magmatic rock
3D fine description
overflow subfacies
accumulation effect
high quality large-medium scale oilfield
