Comprehensive Study on Reservoir Heterogeneity of Toutunhe Formation in the Slope Area, North of Fukang Sag, Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2020.098

Abstract

Abstract:

Reservoir heterogeneity of the Middle Jurassic Toutunhe Formation in the northern slope area of Fukang sag was discussed, which was favorable to guide deeper exploration of the Formation. Macro-/micro-heterogeneity and their controlling factors were determined by using substantial amount of data, such as those from drilling, well-log, core descriptions, sections, particle sizes, and constant-rate mercury injection. The results show that two types of pore structures are developed in the reservoirs of the Toutunhe Formation, leading to strong micro-heterogeneity. Reservoirs have three types of particle rhythm, two types of permeability rhythm and two types of interlayers, causing strong interbedded heterogeneity, intraformational and planar heterogeneity for many coefficients, together with strong macro-heterogeneity. Reservoirs of the Toutunhe Formation have strong heterogeneity, which are controlled by sedimentary and diagenetic environment, with the latter being the main controlling factor. Last but not least, the prime exploration target area is likely the central part of channel in the Toutunhe Formation (1^st member).

Key words: pore structure, double-peak type, single-peak type, macro-heterogeneity, Toutunhe Formation

CLC Number:

TE122.2

YU Jingwei, NIU Zhijie, QI Liqi, SUN Xinming, LIU Ni, ZHANG Jin, CAO Song. Comprehensive Study on Reservoir Heterogeneity of Toutunhe Formation in the Slope Area, North of Fukang Sag, Junggar Basin[J]. Geoscience, 2021, 35(03): 819-831.

Figures/Tables 14

Fig.1 Geological background of the study area and the distribution of the wells

Fig.2 Characteristics of single-peak type pore structure

Fig.3 Characteristics of double-peak type pore structure

Fig.4 Relation between standard deviation and average particle size in Toutunhe Formation in the study area

Fig.5 Relations between relative sorting coefficient and volume fraction of interstitial material in Toutunhe Formation in the study area

Fig.6 Variation characterization of permeability rhythmic and grain-size of Toutunhe Formation in the study area

Table 1 Division standard of reservoir heterogeneity

非均质程度	V_K	T_K	J_K	k
弱	<0.5	<2.0	<2.0	>0.3
中等	0.5~0.7	2.0~3.0	2.0~6.0	0.1~0.3
强	>0.7	>3.0	>6.0	<0.1

Fig.7 Permeability heterogeneity statistics for the reservoirs of Toutunhe Formation in the study area

Table 2 Statistics of distribution characters on interlayers of sandstone reservoir in Toutunhe Formation in Fubei area

层位	夹层厚度/m	夹层平均密度/%	夹层平均频率/(个/m)
J₂t³	0.5~3.6	42	0.3
J₂t²	0.2~2	35	0.22
J₂t¹	0~2	30	0.19

Table 3 Statistical table of stratification coefficient and sandbady density in Toutunhe Formation of Fubei area

层位	分层系数/(层/m)		砂地比/%
层位	范围	平均值	范围	平均值
J₂t³	1~12	6.3	4~70	30
J₂t²	2~16	6.4	13~89	43.8
J₂t¹	0~13	5.9	0~83	39.7

Fig.8 Contrast of the sandbodies in isochronous stratigraphic framework of Toutunhe Formation between well Ful6 to well Fu10 in the study area

Fig.9 Thickness contour map of Toutunhe Formation sandbodies in the study area

Fig.10 Contour maps of the coefficients of anisotropy, porosity and permeability in Toutunhe Formation (2nd member) in the study area

Table 4 Statistics of average mass fraction and clastic composition in Toutunhe Formation in Fubei area

层位	样品数/ 个	石英/%		长石/%		岩屑/%		Q/(F+R)
层位	样品数/ 个	平均	范围	平均	范围	范围	平均	范围	平均
J₂t³	10	15.7	0~27	14.3	0~24	51~100	70	0~0.36	0.2
J₂t²	18	25.4	10~68	24.4	16~38	11~60	50.3	0.1~2.19	0.44
J₂t¹	12	20.7	0~31	18.8	0~27	48~100	60.8	0.16-0.45	0.3

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