Diagenetic Character istics of the Chang 6 Oil-bearing Interval of the Upper Tr iassic in the Jin'an Oilfield, Ordos Basin

LI Bin; MENG Zi-fang; LI Xiang-bo; LU Hong-xuan; ZHENG Min

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Article Navigation > Acta Sedimentologica Sinica > 2005 > 23(4): 574-583

LI Bin, MENG Zi-fang, LI Xiang-bo, LU Hong-xuan, ZHENG Min. Diagenetic Character istics of the Chang 6 Oil-bearing Interval of the Upper Tr iassic in the Jin'an Oilfield, Ordos Basin[J]. Acta Sedimentologica Sinica, 2005, 23(4): 574-583.

Citation:

Diagenetic Character istics of the Chang 6 Oil-bearing Interval of the Upper Tr iassic in the Jin'an Oilfield, Ordos Basin

1.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640;
2.
Oil and Gas Center of Geology and Geophysics Institute, Chinese Academy of Sciences, Lanzhou 730000

Received Date: 2005-01-05
Rev Recd Date: 2005-03-07
Publish Date: 2005-12-10

Abstract

An intensive study has been done in the J ingan oil-field by observing five cross sections and eleven wells,analyzing 108 samp leswith thin section, cathodelumination, SEM, X-ray diffraction and related test materials. It is believed that Chang 6 oil-bearing beds underwent a series of diagenesis, such as compaction, cementation, dissolution and so on. The diagenetic phenomenona are very rich and the diagenetic characters are very obvious and complex.According to the analysis of petrology, it is found that Chang 6 oil-bearing interval is composed of middle size sand-stone and fine sub-sand. After analyzing of the whole situation, granularity is much smaller. Little of them are rock fragments feldspar sandstone. Diagenesis of Chang 6 oil-bearing interval can be divided to two stages, early and late stage. Furthermore, they can also be subdivided into two sub-phases, A and B sub-phase. The diagenetic processes that control reservoir properties include the mechanic compaction, cementation and dissolution of grains. At the early diagenesis, mechanical and chemical compaction is very strong, which reduced the primary porosity. Cementation is an important factor to reservoir, including carbonate, clay and laumontite cementation and so on. Laumontite is special mineral in OrdosBasin and is very abundant. Cementation filled the space among grains and blocked the path between grains are another factors resulting in sandstone compaction and very low permeability. But, at the same time,cements also protect grains from further compaction. At the late diagenesis phase, the dissolution of framework grains,especially the dissolution of feldspar and laumontite, is the key to form secondary porosity. They changed the porosity characteristics of sandstone; engendering new benefit storing beds consisted with secondary porosity. Feldspar is dissolved very commonly and severly. They often form dissoluble porosity among grains. Laumontite has deficient dissoluble forms and its dissolution mostly appear along rein, forming irregular size room among grains. This indicates the direction of exp loration and development for oilfield. In a word, the diagenetic study of reservoir property show that mechanical compaction and cementation is two important diagenetic controlling factors, which make oil-bearing physical property bad and porosity down in reservoir.Dissolution, particularly dissolution of laumontite and feldspar is one ofmost important diagenetic factors controlling the physical p roperty of oil2bearing interval and forming better reservoir.
- Ordos Basin,
- diagenesis,
- clastic rocks,
- reservoir,
- laumontite

References

[1]

1 朱国华. 陕甘宁盆地上三叠统延长组低渗透砂体和次生孔隙砂体的形成[J].沉积学报,1985,(02):1-17.

2 柳益群. 陕甘宁盆地东部上三叠统含油长石砂岩的成岩特点及孔隙演化[J].沉积学报,1996,(03):87-96.

3 罗静兰,张成立,阎世可. 盆地埋藏史及其对砂岩储层物性演化的影响[J].石油与天然气地质,2001,(02):123-129.

4 长庆油田石油地质志编写组. 中国石油地质志[M].北京:石油工业出版社,1992.96-102.

5 长庆油田石油地质志编写组. 中国石油地质志[M].北京:石油工业出版社,1992.133-148.

6 裘怿楠,薛叔浩,严凤祥. 油气储层评价技术[M].北京:石油工业出版社,1994.53-66;224-233.

7 Surdam R C,Crossey L J,Hagen E S. Organic-inorganic interactions and sandstone diagenesis[J].AAPG Bulletin,1989,(01):1-23.

8 黄思静,谢连文,张萌. 中国三叠系陆相砂岩中自生绿泥石的形成机制及其与储层孔隙保存的关系[J].成都理工大学学报（自然科学版）,2004,(03):273-281.

9 郑荣才,柳青梅. 鄂尔多斯盆地长6油层组古盐度研究[J].石油与天然气地质,1999,(01):20-26.

10 Ehrenberg S N. Preservation of anomalously high porosity in deeply buried sandstones by grain-coating chlorite: examples from the Norwegian continental shelf[J].AAPG Bulletin,1993.1260-1286.

11 Baker J C,Havord P J,Martin K R. Diagenesis and petrophysics of the Early Permian Moogooloo sandstone, southern Carnarvon Basin,Western Australia[J].AAPG Bulletin,2000,(2):250-265.

12 张立飞. 陕北三叠系延长统浊沸石的成因及形成条件的理论计算[J].岩石学报,1992,(02):145-152.

13 Frey M. Very Low-grade metamorphism of clastic sedimentary rocks[A].London:Blackie & Son Limited,1987.9-58.

14 Winker H G G. Petrogenesis of metamorphic rocks[M].New York:Springer-Verlag,1979.1-2.

15 赵孟为. 划分成岩作用与埋藏变质作用的指标及其界限[J].地质论评,1995,(03):238-244.

16 Nob Jin Hwan,Boles James R. Origin of zeolite cements in the Miocene sandstones,North Tejon oil fields,California[J].Journal of Sedimentary Petrology,1993,(02):248-260.

17 Wopfner H,Markwort S,Semkiwe P M. Early diagenetic laumontite in the Lower Triassic Manda Beds of the Ruhuhu Basin,Southern Tanzania[J].Journal of Sedimentary Petrology,1991,(01):65-72.

18 孙玉善. 克拉玛依油区沸石类矿物特征及其与油气的关系[J].岩相古地理,1993,(02):37-48.

19 黄思静,刘洁,沈立成,武文惠. 碎屑岩成岩过程中浊沸石形成条件的热力学解释[J].地质论评,2001,(03):301-308.

20 Hoffmann J,Hower J. Facies-related diagenetic alteration in lacustrine-deltaic sandstones[J].SEPM Special Pub,1979.55.

21 帕克,塞尔伍德,贾振远. 沉积物的成岩作用[M].武汉:中国地质大学出版社,1989.65-70.

22 赵孟为,Behr H J. 鄂尔多斯盆地三叠系镜质体反射率和地热史[J].石油学报,1996,(02):15-23.

23 谢传礼,何顺利,魏俊之,田海芹. 鄂尔多斯盆地靖安油田上三叠统延长组6段古湖泊学特征[J].石油大学学报(自然科学版),2000,(01):18-21.

24 柳益群. 关于成岩作用与变质作用界限的讨论[J].地质论评,1996,(03):220-221.

25 柳益群,李文厚. 陕甘宁盆地东部上三叠统含油长石砂岩的成岩特点及孔隙演化[J].沉积学报,1996,(03):87-95.

26 Robie R A,Waldbaum D R. Thermodynamic properties of minerals and related subslances at 298.15°K.(25.O℃)and one atmosphere(1.013 bars)pressureand at highertemperatures[J].USGS Bulletin,1968.256.

27 田景春,曾允孚,尹观. 东营凹陷西部沙河街组三段上部泥岩中白云岩夹层成因研究[J].矿物岩石,1997,(04):61-67.

28 王璞君,王东坡,杜小弟. 松辽盆地白垩系青山口组黑色页岩的形成环境及海水侵入的底流模式[J].岩相古地理,1996,(01):34-43.

29 黄思静,武文慧,刘洁. 大气水在碎屑岩次生孔隙形成中的作用[J].地球科学-中国地质大学学报,2003,(04):419-425.

30 Davies D K,Almon W R,Bonis S B,Hunter B E. Deposition and diagenesis of Tertiary-Holocene volcaniclastics,Guatemala[A].SEPM Special Publication,1979.281-306.

31 Surdam R C,Boles J R. Diagenesis of volcanogenic sandstones[A].SEPM Special Publication,1979.227-247.

32 李怒军,吴志宇,张金亮,张晓玲. 安塞油田王窑区长6油层储层地质[J].西安石油学院学报(自然科学版),1998,(04):34-41.

33 文玲. 靖安油田延长组低孔低渗储层的扫描电镜研究[J].电子显微学报,2003,(04):352-358.

34 Yang Hua,Fu Jinhua,Yu Jian,Du Jinliang,Mu Jingkui. Oil/gas accumulation characteristics and exploration methods of the deltaic lithologic reservoirs in northern Shaanxi area[J].Petroleum Science,2004,(2):69-78.

35 Surdam R C,Boese S W,Crossey L J. The geochemistry of secondary porosity[A].AAPG Memoir,1984.127-49.

36 Meshri I D. On the reactivity of carbonic and organic acids and generation of secondary porosity[A].SEPM special publication,1986.123-128.

37 裘怿楠,薛叔浩,应凤祥. 中国陆相油气储集层[M].北京:石油工业出版社,1997.158-219.

38 柳益群,李文厚,冯乔. 鄂尔多斯盆地东部上三叠统含油砂岩的古地温及成岩阶段[J].地质学报,1997,(01):65-74.

39 长庆油田石油地质志编写组. 中国石油地质志[M].北京:石油工业出版社,1992.133-148.

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沈阳化工大学材料科学与工程学院沈阳 110142

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Diagenetic Character istics of the Chang 6 Oil-bearing Interval of the Upper Tr iassic in the Jin'an Oilfield, Ordos Basin

1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640;

2. Oil and Gas Center of Geology and Geophysics Institute, Chinese Academy of Sciences, Lanzhou 730000

Received Date: 2005-01-05

Rev Recd Date: 2005-03-07

Publish Date: 2005-12-10

Key words:

Abstract: An intensive study has been done in the J ingan oil-field by observing five cross sections and eleven wells,analyzing 108 samp leswith thin section, cathodelumination, SEM, X-ray diffraction and related test materials. It is believed that Chang 6 oil-bearing beds underwent a series of diagenesis, such as compaction, cementation, dissolution and so on. The diagenetic phenomenona are very rich and the diagenetic characters are very obvious and complex.According to the analysis of petrology, it is found that Chang 6 oil-bearing interval is composed of middle size sand-stone and fine sub-sand. After analyzing of the whole situation, granularity is much smaller. Little of them are rock fragments feldspar sandstone. Diagenesis of Chang 6 oil-bearing interval can be divided to two stages, early and late stage. Furthermore, they can also be subdivided into two sub-phases, A and B sub-phase. The diagenetic processes that control reservoir properties include the mechanic compaction, cementation and dissolution of grains. At the early diagenesis, mechanical and chemical compaction is very strong, which reduced the primary porosity. Cementation is an important factor to reservoir, including carbonate, clay and laumontite cementation and so on. Laumontite is special mineral in OrdosBasin and is very abundant. Cementation filled the space among grains and blocked the path between grains are another factors resulting in sandstone compaction and very low permeability. But, at the same time,cements also protect grains from further compaction. At the late diagenesis phase, the dissolution of framework grains,especially the dissolution of feldspar and laumontite, is the key to form secondary porosity. They changed the porosity characteristics of sandstone; engendering new benefit storing beds consisted with secondary porosity. Feldspar is dissolved very commonly and severly. They often form dissoluble porosity among grains. Laumontite has deficient dissoluble forms and its dissolution mostly appear along rein, forming irregular size room among grains. This indicates the direction of exp loration and development for oilfield. In a word, the diagenetic study of reservoir property show that mechanical compaction and cementation is two important diagenetic controlling factors, which make oil-bearing physical property bad and porosity down in reservoir.Dissolution, particularly dissolution of laumontite and feldspar is one ofmost important diagenetic factors controlling the physical p roperty of oil2bearing interval and forming better reservoir.

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Diagenetic Character istics of the Chang 6 Oil-bearing Interval of the Upper Tr iassic in the Jin'an Oilfield, Ordos Basin

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