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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第3期    总第259期    2016年3月

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文章编号:1672-7207(2016)03-0829-10
沾化凹陷渤南洼陷沙二段储层特征及主控因素
苏妮娜,宋璠,邱隆伟

(中国石油大学(华东) 地球科学与技术学院,山东青岛,266580)

摘 要: 为了查明渤南洼陷沙二段优质储层的成因机制,通过开展岩石物性、薄片、扫描电镜、孔隙图像分析等实验,对储层特征进行研究,从沉积和成岩2个方面探讨储层物性的主控因素。研究结果表明:研究区主要发育扇三角洲前缘与滨浅湖滩坝2类砂岩储集体,二者在岩矿成分、胶结物类型、储集物性以及次生孔隙类型等方面均存在一定差别。沉积环境决定了碎屑颗粒粒度与分选程度,进而影响着储层原生孔隙的保存及次生孔隙的发育。扇三角洲储层以泥质胶结为主,压实损孔率高,受酸性流体溶蚀在2 200~2 400 m和2 800~3 100 m形成了2个次生孔隙发育带;滩坝储层以钙质胶结为主,原生孔隙破坏严重,在2 100~2 300 m,2 500~2 800 m和2 900~ 3 200 m处形成了3个次生孔隙发育带。滨浅湖砂坝与溶蚀相的组合储集物性最好,勘探过程中应在全区广布的薄互层砂体中寻找此类单砂体厚度较大、物性较好的砂体。

 

关键词: 储层物性;沉积作用;成岩作用;沙二段;渤南洼陷

Reservoir characteristics and its main controlling factors of Shahejie 2 Formation in Bonan sag, Zhanhua depression
SU Nina, SONG Fan, QIU Longwei

College of Geo-science and Technology, China University of Petroleum, Qingdao 266580, China

Abstract:In order to find out the genetic mechanism of high-quality reservoir of Shahejie 2 Formation in Bonan sag, the reservoir characteristics were systematically studied based on the experiment of petrophysics, thin-sections,electron microscope scanning and pore image analysis, and the main controlling factors of the reservoir quality were studied from two aspects of sedimentation and diagenesis. The results show that there are some differences between the fan delta front and the beach-bar sandbodies mainly exist in the study area about the mineral composition, cement types, reservoir property and secondary pore type. Sorting of clastic grains was determined by sedimentary environment, which affects preservation of primary pores and development of secondary pores. Because of strong argillaceous cementation, the fan delta front reservoir has a high lost ratio of porosity from the compaction. There are two obvious secondary porosity zones in depth of 2 200-2 400 m and 2 800-3 100 m caused by the dissolution of acidic fluid. And because of strong calcareous cementation, the primary pores were severely damaged in the beach bar reservoir. There are three obvious secondary porosity zones in the depth of 2 100-2 300, 2 500-2 800 and 2 900-3 200 m. The best reservoir physical properties mainly develop in the combination zone of sand bar and dissolution diagenetic facies. During the process of exploration in the studied area, it is most important to look for the thick sandbodies with better petrophysics as mentioned in the widely distributed thin sand.

 

Key words: reservoir property; sedimentation; diagenesis; Shahejie 2 Formation; Bonan sag

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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