塔里木盆地古城台缘带寒武系丘滩体沉积构型特征及储层分布规律

doi:10.11743/ogg20210303

Abstract

Abstract:

The four stages of massive Cambrian platform-margin mound-shoal complexes in Gucheng area are the new exploration targets in the Tarim Basin with some promising reservoirs encountered during wildcatting.However, a lack of understanding on the complexity in sedimentary models and reservoir distribution as well as other reservoir forming factors has limited further exploration.Based on core observation, thin section identification, petrographical and geochemical characterization of reservoirs, seismic facies description, and etc., this paper expounds on the identification of sedimentary configuration patterns of the complexes and major factors controlling the reservoirs, and the establishment of a reservoir distribution model under constructive diagenesis constrained by sedimentary configuration.The results show that there are four microfacies (i.e.mound base, mound core, mound flank and mound flat) developed inside the complexes with the sedimentary energy gradually increasing upward, and two types of sedimentary configurations (i.e."accretion type" and "progradation type").The facies belts formed during stages 1 and 2 are "accreted" mound-shoal complexes of vertical superimposition, and those during stages 3 and 4 are "progradational" mound-shoal complexes of lateral stacking.High-quality reservoirs with dissolved pores and cavities are well developed in multiple cyclic distribution with high-energy facies belts as the basis and meteoric water dissolution as an indispensable factor.Generally, the top of the mound-shoal complexes are better in physical properties compared with the bottom, core and flank.The frequently exposed mound-shoal complexes of accretion type contain large-scale reservoirs in a vertically "sandwich-shaped" superimposition distribution; while the long-term exposed progradation type has reservoirs of better physical properties in a laterally "inverted toothbrush-shaped" staggered distribution.The results may be of geological value to the prediction of potential hydrocarbon play fairways in exploration deployment.

Key words: sedimentary configuration, reservoir, mound-shoal complex, Cambrian, Gucheng platform-margin zone, Tarim Basin

CLC Number:

TE122.1

Junlong Zhang, Mingyi Hu, Aiyun Wang, Bin Zhang, Bo Yan, Xiangiang He. Sedimentary configuration and reservoir distribution in the Cambrian mound-shoal complexes at platform margins of Gucheng area, Tarim Basin[J]. Oil & Gas Geology, 2021, 42(3): 557-569.

Figures/Tables 8

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井号	储层类型	岩心物性		测井解释	备注
井号	储层类型	孔隙度/%	渗透率/(10^-3 μm²)	孔隙度/%	备注
城探1	丘坪孔洞型	1.2~5.1 2.4	0.06~3.2 1.1	1.6~11.2 4.7	岩心缝洞被鞍形白云石等部分充填
	丘翼孔隙型	0.8~2.4 1.5	0.003~0.01 0.01	1.5~4.2 2.1	井壁取心
	丘基孔隙型	—	—	1.1~2.7 1.9	未取心
城探2	丘坪相孔洞型	0.7~1.6 0.9	0.01~13.1 2.1	2.1~3.8 3.2	岩心缝洞硅质充填严重
城探2	丘翼孔隙型	—	—	2.0~2.5 2.3	未取心

深度/m	样品类别	δ¹³C/‰	δ¹⁸O/‰	⁸⁷Sr/⁸⁶Sr	备注
6 887.43	丘坪相Ⅰ型颗粒白云岩	-1.05	-10.38	0.709 488
6 889.08	丘坪相Ⅰ型颗粒白云岩	-0.62	-8.92	0.709 699
6 889.08	粗晶鞍形白云石胶结物	-1.45	-8.13	0.709 39
6 889.98	丘坪相Ⅰ型颗粒白云岩	-0.61	-10.57	0.709 85
6 891.18	丘坪相Ⅰ型颗粒白云岩	-0.67	-9.32	0.709 66
6 935.52	丘坪相Ⅰ型颗粒白云岩	-0.47	-10.19	0.709 473
6 936.02	丘坪相Ⅰ型颗粒白云岩	-0.55	-8.11	0.710 795
7 125.60	丘翼相Ⅱ型颗粒白云岩	0.04	-8.57	0.709 276
7 138.40	丘翼相凝块结构白云岩	0.92	-8.87	0.709 313
6 876.53	中粗晶鞍形白云石胶结物	-0.4	-9.8	0.709 608	数据来源据参考文献30
6 888.63	粗晶鞍形白云石胶结物	-1.1	-9.2	0.709 253
6 937.97	中粗晶鞍形白云石胶结物	-1.0	-9.2	0.709 762
6 939.02	粗晶鞍形白云石胶结物	-0.8	-9.1	0.709 439
6 939.34	中粗晶鞍形白云石胶结物	-1.1	-8.2	0.709 027
6 888.75	粗晶方解石胶结物	-1.6	-12.8	0.710 08
6 888.73	粗晶异形方解石胶结物	-1.7	-11.8	0.710 34

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Sedimentary configuration and reservoir distribution in the Cambrian mound-shoal complexes at platform margins of Gucheng area, Tarim Basin

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