鄂尔多斯盆地中部奥陶系马家沟组五段白云岩储层成岩作用及孔隙演化

doi:10.11743/ogg20200110

Abstract

Abstract:

The study focuses on the dolomitization, cementation, dissolution, compaction and pressure-solution of the 5th member of the Ordovician Majiagou Formation in the central Ordos Basin, by means of core and thin section observation, as well as analyses of catholuminescence, scanning electron microscope (SEM), energy spectrum and geochemistry. The diagenetic process of the dolomite reservoir in the study area thus can be divided into two stages:a near surface-shallow burial stage and a medium-deep burial stage. The dolomite reservoir in the study area can be categorized into three types:micritic-microcrystalline dolomite, crystalline-grained dolomite and dolomite grainstone. The dissolution in the near surface environment during the penecontemporaneous period serves as the key for pores' development. Dolomitization is a significant factor conducive to porosity preservation, while cementation is a major diagenesis detrimental to early-developed pores. The micritic with gypsum nodules and gypsum clumps have developed gypsum-moldic and irregular dissolved pores under the impact of meteoric water during a short period of exposure caused by temporary sea level fall; then dolomitization during the shallow-burial period enhanced the compaction-resistance of the limestones, being favorable for pore preservation; but the cementation during the medium-deep burial period occluded part of the pore spaces.The grainstone developed intergranular pores during deposition, and their residual inrergranular pores were preserved after cementation during the penecontemporaneous period and dolomitization during shallow-burial period, resulting in high-quality reservoirs.

Key words: diagenesis, penecontemporaneous dissolution, pore evolution, dolomite, the 5th member of the Majiagou Formation, Ordovician, Ordos Basin

CLC Number:

TE122.2

Qingqing Luo, Bo Liu, Weimin Jiang, Jinxin Yu, Shiqi Liu, Yuanchong Wang, Liubin Wei, Zhenghong Cai. Diagenesis and pore evolution of dolomite reservoir in the 5th member of the Ordovician Majiagou Formation, central Ordos Basin[J]. Oil & Gas Geology, 2020, 41(1): 102-115.

Figures/Tables 12

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样品编号	深度/m	岩性	微量元素含量/10^-6			稀土元素含量/10^-6
样品编号	深度/m	岩性	Fe	Mn	Sr	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	δEu	δCe
L108-3	3 886.52	泥晶灰岩	1 231.70	43.70	117.00	1.99	3.62	0.38	1.30	0.29	0.05	0.20	0.03	0.15	0.03	0.08	0.01	0.07	0.01	8.21	0.24	3.06
Ta112-9	3 311.66	泥晶灰岩	2 291.00	40.90	101.00	1.91	3.45	0.36	1.24	0.27	0.05	0.20	0.03	0.16	0.03	0.08	0.01	0.08	0.01	7.90	0.25	3.04
L92-30	3 986.96	粉晶白云岩	964.06	30.60	92.50	0.94	1.98	0.22	0.75	0.17	0.03	0.14	0.02	0.11	0.02	0.06	0.01	0.05	0.01	4.50	0.23	3.43
Sh367-55	3 964.40	细晶白云岩	907.97	34.00	84.00	0.71	1.17	0.11	0.39	0.08	0.01	0.06	0.01	0.05	0.01	0.02	0.00	0.02	0.00	2.64	0.18	2.86
Ta112-54	3 385.39	粉晶白云岩	2 904.20	48.70	95.90	1.04	2.08	0.23	0.81	0.18	0.03	0.14	0.02	0.11	0.02	0.06	0.01	0.05	0.01	4.79	0.22	3.28
Ta13-14	3 638.70	粉晶白云岩	1 860.10	69.10	82.80	0.42	0.79	0.09	0.32	0.07	0.01	0.06	0.01	0.06	0.01	0.04	0.01	0.04	0.01	1.92	0.26	3.13
Ta38-8	3 631.06	细晶白云岩	1 106.70	39.70	123.00	1.05	1.86	0.20	0.68	0.14	0.02	0.11	0.02	0.10	0.02	0.05	0.01	0.04	0.01	4.31	0.23	2.98
Ta77-71	3 625.80	泥晶白云岩	1 757.60	105.00	84.60	1.41	2.61	0.28	0.98	0.23	0.04	0.17	0.03	0.14	0.03	0.07	0.01	0.07	0.01	6.08	0.23	3.08
T99-25	3 158.54	粉晶白云岩	1 914.80	62.00	81.20	0.76	1.63	0.19	0.68	0.15	0.03	0.11	0.02	0.10	0.02	0.05	0.01	0.06	0.01	3.80	0.24	3.43
T99-14	3 103.40	细晶白云岩	1 176.70	34.10	71.60	0.80	1.73	0.20	0.70	0.16	0.03	0.15	0.02	0.13	0.02	0.07	0.01	0.06	0.01	4.10	0.27	3.49

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Diagenesis and pore evolution of dolomite reservoir in the 5th member of the Ordovician Majiagou Formation, central Ordos Basin

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