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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第42卷

期数:

2020年第03期

页码:

297-312

栏目:

基础地质与矿产地质

出版日期:

2020-05-15

文章信息/Info

Title:

Heterogeneity Genesis of Bioclastic Limestone Reservoirs of Cretaceous Mishrif Formation in M Oilfield, Iraq

文章编号:

1672-6561(2020)03-0297-16

作者:

李峰峰¹; 郭睿¹; 刘立峰¹; 宋世琦²

(1. 中国石油勘探开发研究院,北京 100083; 2. 中国石油大学(北京)地球科学学院,北京 102249)

Author(s):

LI Feng-feng¹;  GUO Rui¹;  LIU Li-feng¹;  SONG Shi-qi²

(1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China; 2. College of Geosciences, China University of Petroleum, Beijing 102249, China)

关键词:

Mishrif组;  生物碎屑灰岩;  非均质性;  沉积作用;  生物扰动作用;  成岩作用;  海平面升降旋回;  伊拉克

Keywords:

Mishrif Formation;  bioclastic limestone;  heterogeneity;  sedimentation;  bioturbation;  diagenesis;  sea level cycle;  Iraq

分类号:

P618.130.1; TE122

DOI:

10.19814/j.jese.2019.09011

文献标志码:

A

摘要:

伊拉克M油田白垩系Mishrif组生物碎屑灰岩储层非均质性强,开发过程中矛盾突出。基于岩芯资料、铸体薄片和实验分析数据,开展储层非均质性成因分析。结果表明:M油田Mishrif组生物碎屑灰岩储层主要受沉积作用、生物扰动作用、成岩作用和海平面升降旋回控制。沉积作用控制了岩石的结构组分和原始物性,并影响了后期的成岩演化; 生物扰动作用破坏了岩石原始结构构造,造成岩石结构松散,为成岩流体提供了渗流通道; 成岩作用控制了岩石物性的改造趋势; 海平面升降旋回造成沉积相变,并控制了海水成岩环境和大气淡水成岩环境。高能沉积环境中,岩石颗粒组分含量高,原始物性好,海平面下降阶段,滩体顶部优先发生溶蚀作用,而滩体底部胶结作用较强,储层物性产生两极分化,优质储层通常与物性隔夹层伴生。低能沉积环境中,岩石泥质组分含量高,原始物性差,但生物扰动作用充分,潜穴物性通常高于基底物性,海平面大幅下降造成岩石处于大气淡水成岩环境,溶蚀性流体可沿生物潜穴渗入,有效改善岩石物性。Mishrif组内部发育多期海平面升降旋回,沉积环境演变迅速,成岩环境不断变化,生物潜穴随机展布,不同成因的储层互相叠置,造成厚层生物碎屑灰岩储层垂向非均质性强。

Abstract:

The bioclastic limestone of Cretaceous Mishrif Formation in M oilfield, Iraq, has strong heterogeneity, and the problem in the process of development is serious. Based on the core observation, cast thin section and experiment data, the heterogeneity genesis was analyzed. The results show that the reservoirs of Mishrif Formation in M oilfield are mainly controlled by sedimentation, bioturbation, diagenesis, and sea level cycles. Sedimentation controls the structural components and original physical properties of rocks, and affects the subsequent diagenetic evolution; bioturbation transforms the rock structure, causes the structure to loosen, and provides seepage channels for diagenetic fluids; diagenesis controls the transformation trend of rocks physical property; sea level cycles cause the change of sediment facies, and control the marine diagenetic environment and meteoric freshwater diagenetic environment. The rocks developed in high-energy sedimentary environment have high content of grain fraction, and the original physical properties are good. During the sea level decline, the upper part of the shoal is preferentially leached, while the lower part is strongly cemented, and the reservoir physical properties are polarized, thus high-quality reservoirs are usually associated with physical interlayers. The rocks developed in low-energy sedimentary environment have high content of argillaceous and poor physical properties. However, the bioturbation is widely developed, the physical properties of the burrow are usually higher than that of the substrate. The sea level decline causes the rocks to be in the meteoric freshwater diagenetic environment, and the dissolute fluid can infiltrate the burrows and effectively improve the physical properties. The Mishrif Formation has multiple stages of sea level cycles, the sedimentary environment evolves rapidly, the diagenetic environment changes continuously, the distribution of biological burrow is random, and reservoirs with different genesis are stacked each other, which result in strong vertical heterogeneity of thick bioclastic limestone reservoirs.

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备注/Memo

备注/Memo:

收稿日期:2019-09-07; 修回日期:2020-04-14; 网络首发日期:2020-05-22投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家科技重大专项项目(2017ZX05030-001)
作者简介:李峰峰(1990-),男,山东日照人,工学博士研究生,E-mail:18810853190@163.com。

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更新日期/Last Update: 2020-05-27