天然气地球科学 ›› 2021, Vol. 32 ›› Issue (9): 1358–1371.doi: 10.11764/j.issn.1672-1926.2021.03.013

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地马五1⁃4亚段风化壳储层的相控作用——以苏里格气田桃2区块为例

池鑫琪1,2(),冯强汉3,许淑梅1,2,4(),舒鹏程1,2,孔家豪1,2,崔慧琪1,2,马慧磊1,2   

  1. 1.中国海洋大学海洋地球科学学院,山东 青岛 266100
    2.中国海洋大学海底科学与探测技术教育部重点实验室,山东 青岛 266100
    3.中国石油天然气股份有限公司长庆油田分公司,陕西 西安 710049
    4.海洋高等研究院/深海圈层与地球系统前沿中心,山东 青岛 266100
  • 收稿日期:2021-02-08 修回日期:2021-03-12 出版日期:2021-09-10 发布日期:2021-09-14
  • 作者简介:池鑫琪(1996-),女,山东德州人,硕士研究生,主要从事沉积学研究.E-mail:807127568@qq.com.|许淑梅(1970-),女,河南许昌人,教授,博士,主要从事沉积学及盆地分析研究.E-mail: xsm@ouc.edu.cn.
  • 基金资助:
    中国石油天然气股份有限公司长庆油田分公司科研技术攻关项目“(鄂尔多斯盆地)桃2区块下古生界储层评价及井位优选”(DSCQC-2019-370)

Facies control of weathering crust reservoir in Mawu1-4 sub-members of Ordos Basin: Case study of Tao 2 block in Sulige Gas Field

Xinqi CHI1,2(),Qianghan FENG3,Shumei XU1,2,4(),Pengcheng SHU1,2,Jiahao KONG1,2,Huiqi CUI1,2,Huilei MA1,2   

  1. 1.College of Marine Geosciences,Ocean University of China,Qingdao 266100,China
    2.Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Qingdao 266100,China
    3.Changqing Oilfield Company,PetroChina,Xi’an 710021,China
    4.Frontiers Science Center for Deep Ocean Multispheres and Earth System,Qingdao 266100,China
  • Received:2021-02-08 Revised:2021-03-12 Online:2021-09-10 Published:2021-09-14
  • Supported by:
    The Scientific Research and Technology Research Project of Changqing Oilfield Branch of CNPC(DSCQC-2019-370)

摘要:

鄂尔多斯盆地苏里格气田桃2区块下古生界中奥陶统马家沟组五段经历风化岩溶作用,形成以(含)膏云岩为主的风化壳岩溶储层。通过对该区块马五1?4亚段的取心观察,发现其表现出与传统碳酸盐岩风化壳截然不同的岩溶作用特征。通过显微观察分析(含)膏云岩的孔隙发育特征,借助海平面变化识别出不同的沉积旋回,以及基于沉积微相分析研究风化壳储层的相控作用并探讨了相控储层的成因机理。结果表明:研究区马五1?4亚段属于潮坪沉积环境。膏质、白云质和灰质沉积共生发育,形成了5个海平面降低、海水变浅的沉积旋回,自下而上分别为潮下带灰云坪和云灰坪,潮间带云坪和泥云坪,潮上带膏云坪。优质储层发育层位恰好与潮上带膏云坪的发育位置一致,风化壳储层具有明显的相控特征。潮上带(含)膏云岩在岩溶作用过程中形成独特的“小孔微缝”型孔隙结构。储层类型为层状相控岩溶成因地层圈闭气藏,有利微相为潮上带膏云坪,风化壳储层在平面上受(含)膏云岩展布的制约成层分布,层内孔隙分布和物性具有明显的均质性。

关键词: 膏模孔, (含)膏云岩, 潮上带膏云坪, 相控作用, 马家沟组, 桃2区块

Abstract:

The fifth Member of Majiagou Formation of the Lower Paleozoic in Ordos Basin experienced weathering karstification and formed weathering crust karst reservoir dominated by gypsum-bearing dolomite. Through the coring observation of Mawu1-4 sub-members in the study area, it is found that the karst features are quite different from the traditional carbonate weathering crust. This paper analyzes the pore development characteristics of gypsum bearing dolomite in Mawu1-4 sub-members through microscopic observation, identifies different sedimentary cycles through sea level change analysis, divides sedimentary microfacies based on this, studies the facies control of weathering crust reservoir, and discusses the genetic mechanism of facies controlled reservoir. The Mawu1-4 sub-members of the study area belongs to the tidal flat sedimentary environment, and the gypsum, dolomite and calcareous deposits coexist and develop, forming five sedimentary cycles of shallow sea level. From bottom to top, they are respectively the dolomitic limestone and calcareous dolomite microfacies bearing tidal flat of subtidal zone, the dolomite and karst breccias bearing tidal flat of intertidal zone, and the anhydrite bearing tidal flat of the supratidal zone. Therefore, the weathering crust reservoir in the study area has obvious facies controlled characteristics. In the process of karstification, the gypsum bearing dolomite in supratidal zone formed a unique pore structure of "small holes and micro cracks". The reservoir type of Mawu1-4 sub-members in the study area is stratified facies controlled stratigraphic closed gas reservoir, and the favorable microfacies are the anhydrite bearing tidal flat of the supratidal zone. The weathering crust reservoir is controlled by the distribution of gypsum bearing dolomite on the plane, and the pore distribution and physical properties are obviously homogeneous.

Key words: Dissolution pores of anhydrite nodule and crystal, Gypsum dolomite, Gypsum dolomite plateau in supratidal zone, Facies control, Majiagou Formation, Tao 2 block

中图分类号: 

  • TE122.2

图1

鄂尔多斯盆地构造单元(a)及研究区位置和风化壳岩溶微地貌(b)(等值线单位: m)"

图2

膏模孔发育的(含)膏云岩(岩心照片)(a)陕50井,3 491.5 m,马五41小层,(含)膏云岩中膏模孔被泥质和方解石半充填—全充填,见残余孔隙,微裂缝发育;(b) 陕50井,3 490.2 m,马五41小层,(含)膏云岩中密集发育的膏模孔被泥质半充填,见残余孔隙;(c)桃35井,3 395.0 m,马五12小层,(含)膏云岩中未充填和局部充填膏模孔发育,并有微裂缝与之伴生"

图3

细—微晶白云岩(铸体薄片照片)(a)陕223井,马五41小层,细晶白云岩夹泥晶白云岩,灰岩白云化,见黄铁矿,(-),×60;(b)陕223井,马五41小层,3 420.22~3 420.40 m,中晶白云石化灰岩,(-),×40"

图4

岩溶角砾岩(岩心照片)(a)桃53井,3 386.0 m,马五13小层,底部岩溶垮塌形成的原地泥质支撑角砾岩;(b)桃47井,3 437.3 m,马五21小层,角砾支撑白云质角砾岩;(c)桃35井,3 403.8 m,马五13小层,渗流带的溶蚀及后期方解石胶结而成的角砾状溶蚀白云质岩"

图5

次生灰岩(铸体薄片照片)(a)陕223井,3 414.68 m,马五41小层,中晶泥质去云化灰岩,(+),×40;(b)陕225井,3 413. 35 m,马五41小层,中晶去云化灰岩,(-),×80"

图6

粉晶膏云岩中连续放大的半充填膏模孔(扫描电镜照片)(a)桃2井,3 418.16 m,马五41小层粉晶(含)膏云岩,膏模孔密集发育;(b)图6(a)放大显示;(c)图6(b)进一步放大显示;(d)桃35井,3 389.86 m,马五13小层粉晶(含)膏云岩,残余膏模孔密集发育;(e)图6(d)的放大显示;(f)图6(e)进一步放大显示,膏模孔被自形铁白云石、萤石等矿物充填,见残余孔隙"

图7

研究区马五1-4亚段(含)膏云岩的膏模孔特征及与之伴生的胀缩微裂缝(铸体薄片照片)(a)陕225井,3 429.19 m,硬石膏晶模孔被微亮晶和亮晶淡水方解石局部或全充填,岩性致密,微裂缝发育,紫色铸体薄片,(-),×40;(b)桃53井,3 381.3 m,(含)膏云岩中硬石膏结核模孔被白云石粉砂、石英、方解石充填,胀缩微裂缝发育并连通膏模孔,红色铸体薄片,(-),×40;(c)桃47井,3 427.0 m,马五11小层硬石膏结核白云岩,胀缩微裂缝发育并将膏模孔连通,蓝色铸体薄片,(-),×40;(d)陕225井,3 455.90 m,粉晶白云岩中硬石膏结核模孔十分发育,胀缩微裂缝连同核模孔,紫色铸体薄片,(-),×40"

图8

马五12—马五31小层沉积微相平面展布(a)马五12小层;(b)马五13小层;(c)马五14小层;(d)马五21小层;(e)马五22小层;(f)马五31小层"

图9

马五32—马五43小层沉积微相平面展布(a)马五32小层;(b)马五33小层;(c)马五41a小层;(d)马五41b小层;(e)马五42小层;(f)马五43小层"

图10

研究区桃34井马五1-4亚段综合柱状图及海平面升降旋回"

图11

桃2-8-29井—桃2-10-29井—陕166井—桃53井—陕147井岩性和沉积微相对比剖面[剖面位置见图1(b)]"

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