Characteristics of Ordovician Karst Reservoirs in Ma 4 Block of Hetianhe Gas Field and Its Influences on Well Productivity

doi:10.7657/XJPG20250504

Abstract

Abstract:

The Ordovician carbonate reservoirs are the main development targets in the Hetianhe gas field. Taking the Ma 4 block as an example, the paleokarst characteristics were investigated based on core, thin section, logging, drilling and fluid data. The relationship between fractures and paleokarstifcaiton or filling was analyzed, the main factors controlling gas well production were evaluated, and the favorable targets for tapping the potential of the karst reservoirs were clarified. The research results show that the characteristics of fracture development in the vertical flow zone are not only related to tectonic characteristics, but also to surface karstification and filling processes. The activity of bottom water in the gas reservoir is related to the burial dissolution. Karst zonation is the main cause for the dual structure of karst reservoirs. The fracture zone is not the active water zone. The production effect of a single well mainly depends on two factors, namely burial dissolution and fracture development in the vertical flow zone.

Key words: Hetianhe gas field, Ma 4 block, Ordovician, karst reservoir, well productivity, main controlling factor

CLC Number:

T122.23

LI Chongyue, XU Wensheng, HAN Fuqiang, YANG Yan, ZHOU Lang, ZHANG Hu, YU Bingyue. Characteristics of Ordovician Karst Reservoirs in Ma 4 Block of Hetianhe Gas Field and Its Influences on Well Productivity[J]. Xinjiang Petroleum Geology, 2025, 46(5): 553-559.

Figures/Tables 7

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Table 1.

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Fig. 5.

Table 2.

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井名	附近古溶洞发育井	古溶洞高度/m	漏失井与古溶洞垂直距离/m	钻井液相对密度	漏失量/ m³	设计水平段长度/m	实钻水平段长度/m	堵漏情况
玛5-4H井	玛5井	34.6	98.3	1.14~1.20	4 447	600	409	无法堵漏
玛5-6H井	玛5井	34.6	51.0	1.12~1.28	5 263	600	62
玛5-8H井	玛5井	34.6	72.0	1.04~1.30	2 262	600	205
玛4-8H井	玛4-10H井	63.4	199.0	1.12~1.18	3 247	600	600	堵漏仍可钻进
玛4-H4井	玛4井	10.2	96.0	1.06~1.27	10 485	600	600
玛4-H2井	玛4-H2井	23.7	159.0	1.24~1.27	2 687	500	500

构造位置	井名	层位	避水高度/m	硫化氢浓度/ （mg·m^-3）	奥陶系钻井液漏失量/m³	储集层特征	日产水量/ t	日产气量/ m³	累计产水量/10⁴ t	累计产气量/10⁸ m³
玛5井区	玛5井	奥陶系	69	5 928.01	0	裂缝不发育，埋藏溶蚀作用强	37.32	13 542	2.1	1.0
	玛5-4H井	奥陶系	290	6 087.06	4 447.53	裂缝发育，埋藏溶蚀作用强	0	0	2.1	1.1
	玛5-6H井	奥陶系	242	6 327.44	5 263.64	裂缝发育，埋藏溶蚀作用强	0	0	0.1	1.0
	玛5-8H井	奥陶系	262	6 968.38	2 262.20	裂缝发育，埋藏溶蚀作用强	0	0	1.5	0.8
岩溶残丘鞍部	玛4-10H井	石炭系	368	427.49	0	裂缝不发育，桑塔木组泥岩遮挡	0.91	83 899	0.2	5.0
	玛5-2H井	石炭系	157	201.35	31.60	裂缝不发育，桑塔木组泥岩遮挡	0.16	18 010	0.1	2.4
	玛401井	石炭系、奥陶系	121	1 053.49	0	裂缝不发育，桑塔木组泥岩遮挡	44.49	0	0.8	0
玛4井区西部	玛4-8H井	奥陶系	325	2 093.17	3 231.57	裂缝发育，埋藏溶蚀作用中等	158.64	0	12.0	1.8
	玛4-H6井	奥陶系	330	987.98	24.00	裂缝不发育，埋藏溶蚀作用中等	4.52	64 599	1.0	4.0
	玛4-12H井	石炭系	326	223.75	169.00	裂缝不发育，埋藏溶蚀作用中等	0	0	3.0	2.3
玛4井区中部	玛4-H4井	石炭系	272	47.04	10 484.98	裂缝发育，埋藏溶蚀作用中等	0	0	1.8	2.1
玛4井区东部	玛4-H2井	奥陶系	215	8.01	2 687.50	裂缝发育，埋藏溶蚀作用弱	3.45	72 266	0.3	6.2
玛4井区东部	玛4-B2H井	奥陶系	205	9.33	0	裂缝不发育，埋藏溶蚀作用弱	1.06	16 967	0.9	2.2