Sedimentary Microfacies in a High-precision Sequence Stratigraphic Framework of the Yijianfang Formation in the T738 Well Area of the Tahe Oilfield, Tarim Basin

doi:10.19657/j.geoscience.1000-8527.2023.107

Abstract

Abstract:

The Yijianfang Formation in the T738 well area of the Tahe Oilfield is of considerable age and has a significant burial depth. It has undergone complex structural and diagenetic reformation but still exhibits excellent reservoir performance. Currently, key exploration and development targets in the T738 well area is primarily concentrated in the fault zones. The “Fault-karst” trap (reservoir) is the primarily drilling target in this area. In sufficient understanding of the sedimentary facies affecting the development of carbonate shoal reservoirs could significantly restrict exploration and development progress. Based on the analysis of logging data and petrographic studies from key exploration wells in the T738 well area, a high-precision sequence stratigraphic framework for the Tabei area in the Tarim Basin has been established. Additionally, a conventional logging facies model for sedimentary microfacies in the open platform of the Yijianfang Formation has been summarized. We classified and described the types and characteristics of sedimentary microfacies. Additionally, we analyzed the thickness distribution of shoals and the distribution characteristics of sedimentary microfacies within the fourth-order sequence. The study suggests that the Yijianfang Formation can be subdivided into one third-order sequences (Sq1) and three fourth-order sequences (Ssq1, Ssq2, and Ssq3). The sedimentary microfacies of the Yijianfang Formation consist of high- to medium-energy shoals, low-energy shoals, intershoals (mounds), and biological reefs (mounds). The grain shoals correspond to an AC of 51-61 μs/m, a DEN of 2.5-2.6 g/cm³, a CNL of 1%-6%, and a RD of 80-3000 Ω·m within the conventional logging discrimination range. The Ssq1 sequence primarily develops smaller and isolated shoals in relatively higher terrain areas. It is situated in the lower part of the transgressive system tract of the third-order sequence, which experiences relatively weaker hydrodynamic conditions. The Ssq2 and Ssq3 sequences have developed shoals that belong to the highstand system tract, characterized by stable thickness, large scale, and good connectivity, with a maximum cumulative thickness of 40 meters.

Key words: high-precision sequence division, sequence stratigraphic framework, sedimentary microfacies of carbonate rock, quantitative phase pattern of conventional logging, distribution of shoal, T738 well area

CLC Number:

P618.1

DING Meng, FAN Tailiang, WU Jun, LI Yu, LI Chenchen, LÜ Kaidi. Sedimentary Microfacies in a High-precision Sequence Stratigraphic Framework of the Yijianfang Formation in the T738 Well Area of the Tahe Oilfield, Tarim Basin[J]. Geoscience, 2024, 38(05): 1270-1290.

Figures/Tables 20

Fig.1 Tectonic setting and geological overview of the Tahe area

Fig.2 Synthetic stratigraphic column for formations and tectonic movements in the Tahe area

Fig.3 Characteristics of lithology and logging curves at the T 7 4 boundary in the angular unconformity contact area

Fig.4 Characteristics of lithology and logging curves at the T 7 4 boundary in the parallel unconformity contact area

Fig.5 Characteristics of lithology and logging curves at the T 7 5 boundary

Fig.6 Comprehensive histogram of the sedimentary sequence of the Yijianfang Formation in Well T738 of the study area

Fig.7 Petrological characteristics near the fourth-order sequence boundary in the Yijianfang Formation

Table 1 Division scheme of sequence stratigraphy for the Yijianfang Formation of the Lower to Middle Ordovician

系	统	组	层序底界面	四级层序	三级层序
奥陶系	上统	恰尔巴克组	$T 74$
	中统	一间房组	SByj2	Ssq3	Sq1
			SByj1	Ssq2
			$T 75$	Ssq1

Table 1 Division scheme of sequence stratigraphy for the Yijianfang Formation of the Lower to Middle Ordovician

系	统	组	层序底界面	四级层序	三级层序
奥陶系	上统	恰尔巴克组	$T 74$
	中统	一间房组	SByj2	Ssq3	Sq1
			SByj1	Ssq2
			$T 75$	Ssq1

Fig.8 Sequence correlation section of the wellAD6-TH10347-TH10334-TH10335-TH10209-T738-TH10210-TH10233-TH10245

Fig.9 Petrological characteristics in the Yijianfang Formation of the T738 well area

Fig.10 Petrological characteristics of reef-building organisms and organic boundstone

Table 2 Classification scheme of sedimentary facies of the Yijianfang Formation in the Tahe area

沉积相	亚相	岩心、薄片识别微相	测井识别的微相组合
开阔台地相	颗粒滩	砂屑滩、生屑滩、鲕粒滩	高能滩、中能滩、低能滩
	丘滩间	丘滩间	丘滩间
	台内礁(丘)	生物礁(丘)	/

Fig.11 Types and characteristics of sedimentary microfacies in the Yijianfang Formation

Fig.12 Characteristics of sensitive logging curves corresponding to typical thin sections of dominant sedimentary facies in well T704

Fig.13 Cross plot of conventional logging curves for key wells (AD6, S91, T704, T737, and T738)

Table 3 Range of discriminant values for particle shoals in conventional logging curves

测井曲线名称	值域范围
AC(μs/m)	51~61
DEN(g/cm³)	2.5~2.6
CNL(%)	1~6
RD(Ω·m)	80~3000

Fig.14 Microfacies correlation section of wells S86, T705, T754, TH10244, TH10214, T738, TH12176, and TH12179

Fig.15 Isopleth of shoals (a) and distribution of sedimentary microfacies (b) in the Ssql sequence of the Yijianfang Formation

Fig.16 Isopleth of shoals (a) and distribution of sedimentary microfacies (b) in the Ssq2 sequence of the Yijianfang Formation

Fig.17 Isopleth of shoals (a) and distribution of sedimentary microfacies (b) in the Ssq3 sequence of the Yijianfang Formation

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