台缘礁分类、特征、发育模式及与可容空间耦合关系——以塔里木盆地中东部地区良里塔格组良二段为例

doi:10.11764/j.issn.1672-1926.2018.12.016

天然气地球科学

台缘礁分类、特征、发育模式及与可容空间耦合关系——以塔里木盆地中东部地区良里塔格组良二段为例

石平舟 ¹，王振宇¹，东玉² ，范坤宇³

1.西南石油大学地球科学与技术学院，四川成都 610500；
2.中国石油塔里木油田库车油气开发部，新疆库尔勒 841000；
3.中国石油塔里木油田分公司勘探开发研究院，新疆库尔勒 841000

收稿日期:2017-05-23 修回日期:2018-12-19 出版日期:2019-05-10
通讯作者: 王振宇（1964-），男，河南滑县人，教授，博士，主要从事沉积学、油气储层研究. E-mail:wangzhy506@163.com.
作者简介:石平舟(1984-)，男，新疆喀什人，博士研究生，主要从事碳酸盐岩沉积储层研究.E-mail：shipingzhou0403@126.com.
基金资助:
中国石油塔里木油田分公司勘探开发研究院项目“塔中Ⅰ号坡折带上奥陶统礁滩体储层特征与评价”（编号：041006050036）资助.

The classification,characteristics and development model and couplingrelation with different accommodation space of platform margin reef:Case study of L2 member of Lianglitage Formation in the eastern Tazhong area,Tarim Basin

Shi Ping-zhou¹,Wang Zhen-yu¹,Dong Yu²,Fan Kun-Yu³

1.School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;
2.Kuqa Oil and Gas Development Department,PetroChina Tarim Oilfield Company,Korla 841000 China;
3.Exploration & Development Research Institute,PetroChina Tarim Oilfield Company,Korla 841000,China

Received:2017-05-23 Revised:2018-12-19 Online:2019-05-10

摘要/Abstract

摘要： 塔里木盆地塔中东部地区晚奥陶世良里塔格组发育台缘礁。通过单井镜下薄片观察及礁相对比剖面发现，纵向上发育2~4个礁生长旋回，单个旋回厚度为30~80m，横向可对比性较好。根据可容空间变化与礁生长关系，将礁划分为退积礁、进积礁、并进礁3种类型，即：①垂向可容空间增加，即相对海平面上升速度大于礁生长速度时，形成退积礁；②垂向可容空间减少，即相对海平面上升速度小于礁生长速度时，形成进积礁；③垂向可容空间不变，即相对海平面与礁生长动态平衡，形成并进礁。并分别建立了3种礁的识别标志及与可容空间的耦合关系和成因模式：①退积礁，测井曲线表现为自然伽马(GR)低值，深双侧向测井均表现为近平直状，造礁生物以管孔藻，块状、枝状和板状珊瑚及苔藓虫为主，多发育于高水位沉积早期，台地向陆地迁移时期；②进积礁，测井曲线表现为自然伽马(GR)中—低值，深双侧向测井均表现为低值，造礁生物以海百合、浮游介形虫、隐藻等为主，多发育于高水位沉积晚期，海平面下降或静止时，台地边缘向盆地方向迁移，礁体层位逐渐抬高；③并进礁，测井曲线上表现为自然伽马(GR)低值，深浅双侧向测井表现为中高值；造礁生物以腹足类、棘皮类等及藻类为主，并进礁多发育于高水位沉积中期，台地边缘向两侧发生迁移，台缘宽度变大。

关键词: 可容空间, 台缘礁, 退积礁, 进积礁, 并进礁

Abstract: The platform margin reef was developed in the Late Ordovician Lianglitage Formation in the eastern Tazhong area of Tarim Basin.According to the thin section observation under single-well microscopy and the relative ratio profile of reefs,2-4 reef growth cycles were developed vertically,with the thickness of single cycle at 30-80m and good lateral contrast.According to the relationship between the variation of the accommodation space and the growth of reefs,reefs are divided into three types:(1) The vertical capacity increases,that is,when the relative sea level rises faster than the growth rate of reefs,retrogradation reefs are formed;(2) The vertical capacity decreases,that is,when the relative sea level rise speed is lower than the growth rate of reef,progradational reef is formed;(3) The vertical capacitance space remains unchanged,that is,the dynamic equilibrium exists between the growth of the reef and the sea level,aggradational reef is formed.The identification marks of three kinds of reefs and their coupling relationship with soluble space and their genetic models are established respectively:(1) Retrogradational reef.The logging curve of natural gamma ray (GR) is low,and the deep dual laterolog is nearly flat.The reef-forming organisms with,block,dendritic,and plate corals and sea moss is given priority to,more development in the early high water deposition,platform on the landward migration period.The reef-building organisms are mainly composed of solenopora,corals with blocky,dendritic and tabular form,and bryworm.Most of them are developed in the early stage of high water level deposition and stage of platform migration to land.(2) Progradational reef.The logging curve shows medium to low value of natural gamma (GR),and the deep dual-lateral logging shows low value.The reef-building organisms mainly include sea lilies,pelagic plankton and cryptophyta,mostly developed in the late stage of high-water level deposition.When the sea level drops or keeps still,the platform edge moves towards the basin,and the reef level gradually rises.(3) Aggradational reef.Low natural gamma (GR) value is shown in logging curves,and medium and high value is shown in the deep and shallow dual laterolog logs.The reef-building organisms mainly include gastropods,echinodermata and algae,and the reefs mostly develop in the middle of high-water deposition.

Key words: Accommodation space, Platform margin reef, Retrogradational reef, Progradational reef, Aggradational reef

中图分类号:

TE122.2

石平舟, 王振宇, 东玉, 范坤宇. 台缘礁分类、特征、发育模式及与可容空间耦合关系——以塔里木盆地中东部地区良里塔格组良二段为例[J]. 天然气地球科学, 2019, 30(5): 673–685.

Shi Ping-zhou, Wang Zhen-yu, Dong Yu, Fan Kun-Yu. The classification,characteristics and development model and couplingrelation with different accommodation space of platform margin reef:Case study of L2 member of Lianglitage Formation in the eastern Tazhong area,Tarim Basin[J]. Natural Gas Geoscience, 2019, 30(5): 673–685.

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