| 东爪哇盆地抱球虫灰岩遗迹化石及其沉积环境分析 |
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| 引用本文： | 郭沫贞,吕福亮,邵大力,侯福斗,杨涛涛,李东.东爪哇盆地抱球虫灰岩遗迹化石及其沉积环境分析[J].沉积学报,2021,39(3):713-722. |
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| 作者姓名： | 郭沫贞 吕福亮 邵大力 侯福斗 杨涛涛 李东 |
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| 作者单位： | 1.中国石油杭州地质研究院，杭州 310023 |
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| 基金项目： | 中国石油天然气集团公司科学研究与技术开发项目2019D?4309 |
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| 摘 要： | 抱球虫灰岩是印尼东爪哇盆地已发现油气藏的主要储层岩性之一，是该盆地重要的勘探目的层。该套发育于上新世的抱球虫灰岩，其储层性质优，为高孔中高渗型性储层。但对该类灰岩储层的形成条件、沉积环境因缺乏可靠的相标志而认识不一，从而影响了对该类储层的油气勘探。通过对该套灰岩发育的遗迹化石研究，共识别出Ophiomorpha，Asterosoma，Palaeophycus，Thalassinoides，Phycosiphon，Zoophycos，Teichichnus及Terebellina等8个遗迹属。按其古生态和及其宿主岩性沉积学特征，将其划分出三类遗迹组合:1）Ophiomorpha?Asterosoma遗迹组合，主要发育于抱球虫颗粒岩和泥质抱球虫颗粒岩中，代表中低等水动力能量的下临滨沉积环境，以颗粒滩沉积为主；2）Zoophycos?Palaeophcus遗迹组合，主要发育于泥质抱球虫颗粒岩和抱球虫颗粒质泥岩中，代表远滨过渡带和棚内洼地沉积环境，主要为正常浪基面以下正常海洋沉积夹风暴作用沉积，以抱球虫灰泥沉积为主；3）Zoophycos?Phycisophon遗迹组合，主要发育于抱球虫颗粒质泥岩中，代表滨外陆棚沉积环境，为风暴浪基面以下正常的海洋灰泥和泥岩沉积。综合岩石类型、岩石序列组合及遗迹化石组合，提出研究区该套抱球虫灰岩下临滨至滨外陆棚的沉积模式。这对研究区该类储层的沉积和成因有重要意义，为此类储层控制因素及展布的研究奠定了基础，并对该类海域储层的油气勘探有重要指导意义。
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| 关 键 词： | 抱球虫灰岩 遗迹化石 沉积环境 上新统 东爪哇盆地 |
| 收稿时间： | 2020-03-05 |
Ichnofossils in Globigerinid Limestone and Their Sedimentary Environments,East Java Basin |
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| GUO MoZhen,Lü FuLiang,SHAO DaLi,HOU FuDou,YANG TaoTao,LI Dong.Ichnofossils in Globigerinid Limestone and Their Sedimentary Environments,East Java Basin[J].Acta Sedimentologica Sinica,2021,39(3):713-722. |
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| Authors: | GUO MoZhen Lü FuLiang SHAO DaLi HOU FuDou YANG TaoTao LI Dong |
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| Institution: | 1.PetroChina Hangzhou Research Institute of Petroleum Geology, Hangzhou 310023, China2.China National Oil and Gas Exploration and Development Corporation (CNODC) Singapore Branch & Singapore Petroleum Company Pte. Limited 039192, Singapore |
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| Abstract: | Globigerinid limestone is one of the main reservoirs in oil?gas reservoirs discovered in the East Java Basin， and also one of the main exploration targets. Developed in the Pliocene， Globigerinid limestone reservoirs are characterized by high porosity and medium?high permeability. However， the formation conditions and sedimentary environment of this kind of limestone reservoir are not well understood due to the lack of reliable facies markers， which affects the exploration for this kind of reservoir. Based on trace fossils preserved in the formation， a total of eight ichnogenera were identified: Ophiomorpha， Asterosoma， Palaeophycus， Thalassinoides， Phycosiphon， Zoophycos， Teichichnus and Terebellina. According to their ethological and morphological features together with the lithological characteristics of the host rock， three ichnoassemblages were established: （1） Ophiomorpha?Asterosoma ichnoassemblage， which developed in Globigerinid grainstone and packstone， represents grain beach deposition in the lower shoreface environment with medium?low hydrodynamic energy； （2） Ophiomorpha?Palaeophycus ichnoassemblage， which developed in Globigerinid packstone and wackestone， occurs in inner shelf lowland or offshore environments with normal marine and storm?induced depositions； （3） Zoophycos?Phycosiphon ichnoassemblage， which developed in wackestone and mudstone， represents an outer?shelf environment. Combining the paleosedimentary environment with the ichnogenera and ichnoassemblages， it is proposed that Globigerinid limestone was deposited in lower shoreface to outer?shelf environments， and its sedimentary model was also established. For the Globigerinid limestone in the study area， these conclusions have great significance， not only regarding its depositional genesis， controlling factors and distribution， but also for oil and gas exploration in this type of reservoir. |
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