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叠前地震多属性分析在碳酸盐岩中的应用：以元坝区块为例 总被引：2，自引：0，他引：2
目前含气碳酸盐岩AVO异常响应特征的类型是参考含气砂岩的分类，但是通过实践证明，此分类方法同样适用于碳酸盐岩。在纵向上我们通过叠前Lambda—Mu—Rho技术确定各层段的含气性，然后在平面上通过三参数AVO反演技术预测含气分布。AVO最重要的思想是通过分析叠前地震信息随炮检距变化特征，揭示岩性和油气的关系。运用测井曲线和Biot—gassmann流体替代理论建立AVO正演模型，明确储层的AVO异常类型，建立相应的AVO监测标志，定性的进行油藏描述。三参数AVO反演过程中利用AVO关系提取隐藏在地震信息中的多种岩性参数和含气性参数，从不同角度同时分析预测岩性和烃类。在元坝区块飞仙关组碳酸盐岩储层油气分布预测中，取得了较好的效果。 相似文献
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鄂尔多斯盆地上古生界地层AVO技术的应用 总被引：2，自引：0，他引：2
AVO技术是利用振幅随炮检距 (或入射角 )变化的规律 ,求取地下地层的岩性信息。鄂尔多斯盆地是典型克拉通盆地 ,构造平缓 (倾角不到 1°) ,断层不发育 ,非常适用 AVO理论假设反射层为水平层这一基本条件。根据工区的地震地质特征 ,在 AVO分析的基础上 ,应用钻井地质、测井资料设计的模型 AVO正演及反演的研究 ,总结了一套在现有地震分辨率条件下的鄂尔多斯盆地上古生界储层 AVO响应特征。即 :无论砂岩储层是否含气 ,其底部反射振幅随入射角增加均会出现从强到弱—极性反转—从弱到强的现象 ,只是反转的角度有所差异 ;在梯度剖面上 ,含气砂岩与不含气砂岩的亮点特征差异较大。据此响应特征预测了有利的储集区。 相似文献
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川东北元坝地区二叠系长兴组礁滩储层的油气、水系统相对复杂,钻遇水层或气水同层的情况时有发生,所以探索出一种有效的储层识别技术具有非常重要的意义。通过对井中储层段的流体类型进行物性分析研究,得出了该区含气层、气水同层、水层及非储层的地球物理响应特征;含气层、气水同层都具有泊松比值、λρ(拉梅系数λ与密度ρ的乘积)值较非储层值低的特点。利用AVO反演技术对该区礁滩储层进行反演,得到相应的泊松比、λρ数据体。利用反演所得到的泊松比、λρ成果预测了元坝地区长兴组礁滩储层的含气有利分布范围,预测结果和该区测井资料吻合度较高。结论表明,采用AVO反演技术进行海相礁滩储层识别具有重大现实意义。 相似文献
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基于普罗尼变换的非线性滤波方法避开了基于常规滤波技术的属性分析方法的局限性，具有较高的纵、横向分辨率。利用该方法得到地震数据在不同频带的衰减异常和变异特征，可以研究储层非均质性，预测其裂缝、孔隙发育程度，识别有利的油气聚集带。在TBM气田砂岩储层非均质性和含气识别预测应用中，高频带滤波衰减异常反映了裂缝、孔隙发育程度；在不同频带滤波结果的变异特征，反映了储层的含气性。 相似文献
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研究区目的层埋深较浅,地震剖面上存在多套强反射轴。由于钻井资料少,虽然已知油气层为强反射的"亮点"特征,但样本点少,缺少强反射与含油气性的统计关系,无法直观判定强反射的流体属性。研究区目的层地震资料分辨率好,保幅性好,具备开展识别"亮点"油气藏的条件。本文利用一系列技术手段对目的层段发育的地震强反射区进行了综合研究,例如正演模拟判定真假"亮点"、AVO地震属性识别"亮点"、道集检测验证"亮点"油气性等,总结了研究区目的层段"亮点"型油气层的响应特征,并进一步刻画了含气砂体的发育规模,最后提出了勘探方向。 相似文献
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地震技术是研究隐蔽油气藏的关键技术。岩石物理是地震信号与储层性质之间的桥梁，它可以帮助我们更好的理解岩石和流体性质的地震响应。流体替代分析是岩石物理分析的重要部分，它是流体识别和储层定量研究的工具之一，在AVO分析中起了重要的作用。流体替代的理论基础是Gassmann方程。在岩石物理技术指导下，对某工区探井进行了流体替代分析，并根据替代后的结果分析了波阻抗随深度、岩性和含油气性变化的规律，同时根据替代结果进行了AVO正演研究，比较分析了储层中流体分别为盐水、气和油时的响应特征，并据此根据实际的部分叠加道集进行了烃类异常识别。 相似文献
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利用Hampson-Russell／Geoview／AVO软件研究含气砂岩的地震反射振幅随炮检距的变化关系及AVO属性的特征。并将AVO技术应用于大港油田黄骅坳陷港186井区的天然气藏研究。结果表明，在地质条件复杂的地区，三维AVO分析可区分真假天然气响应，准确确定已知气藏及异常区的空间展布范围。 相似文献
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珠江口盆地神狐海域是天然气水合物钻探和试验开采的重点区域,大量钻探取心、测井与地震等综合分析表明不同站位水合物的饱和度、厚度与气源条件存在差异。本文利用天然气水合物调查及深水油气勘探所采集的测井和地震资料建立地质模型,利用PetroMod软件模拟地层的温度场、有机质成熟度、烃源岩生烃量、流体运移路径以及不同烃源岩影响下的水合物饱和度,结果表明:生物成因气分布在海底以下1500 m范围内的有机质未成熟地层,而热成因气分布在深度超过2300 m的成熟、过成熟地层。水合物稳定带内生烃量难以形成水合物,形成水合物气源主要来自于稳定带下方向上运移的生物与热成因气。模拟结果与测井结果对比分析表明,稳定带下部生物成因气能形成的水合物饱和度约为10%,在峡谷脊部的局部区域饱和度较高;相对高饱和度(>40%)水合物形成与文昌组、恩平组的热成因气沿断裂、气烟囱等流体运移通道幕式释放密切相关,W19井形成较高饱和度水合物的甲烷气体中热成因气占比达80%,W17井热成因气占比为73%,而SH2井主要以生物成因为主,因此,不同站位甲烷气体来源占比不同。 相似文献
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琼东南盆地深水区新近系海底扇沉积特征与资源潜力 总被引：1，自引：1，他引：0
综合利用钻井、岩心、薄片及分析化验资料研究了琼东南盆地深水区新近系海底扇沉积特征,并利用最新的三维地震资料,通过井震精细标定、多属性融合技术、方差体切片、三维地貌砂体镂空等综合技术手段,精细刻画了海底扇砂体的空间分布特征。研究结果表明,深水区新近系海底扇是由陆架区的砂体滑塌并二次搬运形成,形成过程具有多期次性。受不同物源的影响,海底扇岩性和物性存在较大的差异。海底扇岩性及沉积构造具有砂质滑塌、碎屑流、浊流和深水底流改造的特征。海底扇的沉积微相、厚度、砂泥比和砂泥岩空间配置关系直接控制了地震振幅反射强度和频率的变化。砂体纵向叠置,横向连片,并被后期泥质水道切割分块形成多个岩性圈闭。综合分析认为,深水区海底扇砂体发育区烃源条件优越,储盖配置关系和圈闭条件良好,具备形成大中型岩性油气藏的有利条件,具有较大的油气勘探潜力。 相似文献
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古巴三区块是2005年中国石化获得的风险勘探开发合同区块，位于墨西哥湾西南部，是古巴西部的前陆盆地之一。结合该盆地勘探现状，对相关的钻井、物探以及地球化学等资料进行石油地质综合分析，评价了该盆地的油气成藏条件及其勘探潜力，预测了有利区带。三区块主要发育上侏罗统一下白垩统的泥灰岩、泥质灰岩和中-下侏罗统泥页岩两套主要烃源岩，储层以泥晶灰岩、灰岩和砂砾岩为主，区内早期形成的圈闭在造山期基本遭到破坏，有效的圈闭主要形成于晚古近纪，圈闭类型有背斜、断鼻、断块和地层圈闭等，推测可能发育多套储盖组合。据区域对比和钻井资料分析，区内的前陆冲断带是本区最有利勘探区带，南盆地北缘发育较厚的第三系，推测是本区有利远景区。 相似文献
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AVO (Amplitude Versus Offset) is a seismic exploration technology applied to recognize lithology and detect oil and gas through analyzing the feature of amplitude variation versus offset. Gas hydrate and free gas can cause obvious AVO anomaly. To find geophysical evidence of gas hydrate and free gas in Shenhu Area, South China Sea, AVO attribute inversion method is applied. By using the method, the multiple seismic attribute profiles and AVO intercept versus gradient (I-G) cross plot are obtained. Bottom-simulating reflector (BSR) is observed beneath the seafloor, and the AVO abnormal responses reveal various seismic indicators of gas hydrate and free gas. The final AVO analysis results indicate the existence of gas hydrate and free gas in the upper and lower layers of BSR in the study area. 相似文献
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Shuo Chen Renhai Pu Huiqiong Li Hongjun Qu Tianyu Ji Siyu Su Yunwen Guan Hui Zhang 《海洋学报(英文版)》2022,41(9):86-106
The Dongfang1-1 gas field (DF1-1) in the Yinggehai Basin is currently the largest offshore self-developed gas field in China and is rich in oil and gas resources. The second member of the Pliocene Yinggehai Formation (YGHF) is the main gas-producing formation and is composed of various sedimentary types; however, a clear understanding of the sedimentary types and development patterns is lacking. Here, typical lithofacies, logging facies and seismic facies types and characteristics of the YGHF are identified based on high-precision 3D seismic data combined with drilling, logging, analysis and testing data. Based on 3D seismic interpretation and attribute analysis, the origin of high-amplitude reflections is clarified, and the main types and evolution characteristics of sedimentary facies are identified. Taking gas formation upper II (IIU) as an example, the plane distribution of the delta front and bottom current channel is determined; finally, a comprehensive sedimentary model of the YGHF second member is established. This second member is a shallowly buried “bright spot” gas reservoir with weak compaction. The velocity of sandstone is slightly lower than that of mudstone, and the reflection has medium amplitude when there is no gas. The velocity of sandstone decreases considerably after gas accumulation, resulting in an increase in the wave impedance difference and high-amplitude (bright spot) reflection between sandstone and mudstone; the range of high amplitudes is consistent with that of gas-bearing traps. The distribution of gas reservoirs is obviously controlled by dome-shaped diapir structural traps, and diapir faults are channels through which natural gas from underlying Miocene source rocks can enter traps. The study area is a delta front deposit developed on a shallow sea shelf. The lithologies of the reservoir are mainly composed of very fine sand and coarse silt, and a variety of sedimentary structural types reflect a shallow sea delta environment; upward thickening funnel type, strong toothed bell type and toothed funnel type logging facies are developed. In total, 4 stages of delta front sand bodies (corresponding to progradational reflection seismic facies) derived from the Red River and Blue River in Vietnam have developed in the second member of the YGHF; these sand bodies are dated to 1.5 Ma and correspond to four gas formations. During sedimentation, many bottom current channels (corresponding to channel fill seismic facies) formed, which interacted with the superposed progradational reflections. When the provenance supply was strong in the northwest, the area was dominated by a large set of delta front deposits. In the period of relative sea level rise, surface bottom currents parallel to the coastline were dominant, and undercutting erosion was obvious, forming multistage superimposed erosion troughs. Three large bottom current channels that developed in the late sedimentary period of gas formation IIU are the most typical. 相似文献
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Cong Chen Xiangtao Zhang Guangrong Peng Zulie Long Baojun Liu Xudong Wang Puqiang Zhai Bo Zhang 《海洋学报(英文版)》2023,42(3):189-200
The eastern main sub-sag (E-MSS) of the Baiyun Sag was the main zone for gas exploration in the deep-water area of the Zhujiang River (Pearl River) Mouth Basin at its early exploration stage, but the main goal of searching gas in this area was broken through by the successful exploration of the W3-2 and H34B volatile oil reservoirs, which provides a new insight for exploration of the Paleogene oil reservoirs in the E-MSS. Nevertheless, it is not clear on the distribution of “gas accumulated in the upper layer, oil accumulated in the lower layer” (Gasupper-Oillower) under the high heat flow, different source-rock beds, multi-stages of oil and gas charge, and multi-fluid phases, and not yet a definite understanding of the genetic relationship and formation mechanism among volatile oil, light oil and condensate gas reservoirs, and the migration and sequential charge model of oil and gas. These puzzles directly lead to the lack of a clear direction for oil exploration and drilling zone in this area. In this work, the PVT fluid phase, the origin of crude oil and condensate, the secondary alteration of oil and gas reservoirs, the evolution sequence of oil and gas formation, the phase state of oil and gas migration, and the configuration of fault activity were analyzed, which established the migration and accumulation model of Gasupper-Oillower co-controlled by source and heat, and fractionation controlled by facies in the E-MSS. Meanwhile, the fractionation evolution model among common black reservoirs, volatile reservoirs, condensate reservoirs and gas reservoirs is discussed, which proposed that the distribution pattern of Gasupper-Oillower in the E-MSS is controlled by the generation attribute of oil and gas from source rocks, the difference of thermal evolution, and the fractionation controlled by phases after mixing the oil and gas. Overall, we suggest that residual oil reservoirs should be found in the lower strata of the discovered gas reservoirs in the oil-source fault and diapir-developed areas, while volatile oil reservoirs should be found in the deeper strata near the sag with no oil-source fault area. 相似文献
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大陆架科学钻探CSDP-02井的钻探,开启了南黄海中-古生界研究的新局面。本文利用过CSDP-02井的多道地震、测井和岩心资料,在对中部隆起中-古生界地层频谱分析的基础上,采用基于S变换的谱分解方法,对南黄海中部隆起中-古生界地层进行了谱分解,将地震数据由时间域转换到频率域,得到了不同频率的等频率剖面。结果表明,南黄海中部隆起存在3套可能的储集层,分别对应三叠系青龙组灰岩、二叠系龙潭组砂岩和石炭系灰岩,在等频率剖面上,均表现为明显的低频异常,频谱特征呈现低频高能、高频低能的特征,在高频剖面上,储层异常被浅层高频异常掩盖。通过与CSDP-02井的岩心和测井结果进行对比发现,3套储集层的频率衰减现象与岩心取样中的油浸层相关,这是我国首次在南黄海中-古生界发现油气显示,对指导南黄海中-古生界油气勘探具有重要意义。 相似文献