Characteristics and Genesis of Condensate Reservoirs of Lianggaoshan Formation in Fuling Area, Southeastern Sichuan Basin

doi:10.7657/XJPG20220402

Abstract

Abstract:

In the condensate gas reservoirs of the Lower Jurassic Lianggaoshan formation in the Fuling area, southeastern Sichuan basin, the fluid properties are complex and the gas-oil ratios from multi-well testing differ greatly. In this paper, the basic characteristics of oil and gas were clarified by using the data such as crude oil chromatography-mass spectrometry, gas composition, carbon isotopes and fluid inclusions. The gas reservoir properties and phase states were determined with the empirical calculation method for gas compositions and through the experiments simulating PVT fluid phase state. On this basis, the genesis and forming process of condensate gas reservoirs were discussed. The results show that the gas reservoirs in the Lianggaoshan formation are mainly condensate gas reservoirs without oil rings, where hydrocarbons are mainly primary condensate oil and gas generated from Type Ⅱ₂ kerogens in the mature stage, and cracking gas is found locally. The thermal evolution degree of source rocks and the differences in the present temperature and pressure conditions of formation are the main contributors to different reservoir properties. The superimposed areas of the relatively deep-burial areas during the hydrocarbon accumulation period on the areas with relatively high pressure at present are favorable targets for future exploration.

Key words: southeastern Sichuan basin, Fuling area, Lianggaoshan formation, genesis of condensate oil/gas, gas accumulation, maturity

CLC Number:

TE112.111

LI Mingyang, LI Chengyin, QU Dapeng. Characteristics and Genesis of Condensate Reservoirs of Lianggaoshan Formation in Fuling Area, Southeastern Sichuan Basin[J]. Xinjiang Petroleum Geology, 2022, 43(4): 387-395.

Figures/Tables 12

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Table 1.

Table 2.

Methods and criteria for discriminating phase states of condensate gas reservoirs (modified from References [9] and [10])"

判别方法	参数	判别标准
方框图法	$C 2 C 3$ 、 $100 C 2 C 3 + C 4$ 、 $100 C 2 C 1$ 、 $C 2 +$	方框图版
因子法	$F = C 2 + C 3 + C 4 C 5 +$ $Z 1 = 0.88 C 5 + + 0.99 C 1 C 5 + + 0.97 C 2 C 3 + 0.99 F 3.71$ $Z 2 = 0.79 C 5 + + 0.98 C 1 C 5 + + 0.95 C 2 C 3 + 0.99 F 3.71$	带大油环凝析气藏： $Z 1$ <17.0、 $Z 2$ <17.0 带小油环凝析气藏：17.0≤ $Z 1$ ≤21.0、 17.0≤ $Z 2$ ≤20.5 无油环凝析气藏 $: Z 1$ >21.0、 $Z 2$ >20.5
$C 5 + 值和 C 1 C 5 +$ 值法	$C 5 + 、 C 1 C 5 +$	无油环凝析气藏： $C 5 +$ ≤1.75%或 $C 1 C 5 +$ ≥52 带油环凝析气藏： $C 5 +$ >1.75%或 $C 1 C 5 +$ <52
秩数法	$C 1 C 5 + 、 C 2 + C 3 + C 4 C 5 + 、 C 2 C 3 、 C 5 +$	按等级区间给4个参数赋值,以等级数之总k进行判别,k>11为带油环凝析气藏,k≤9为无油环凝析气藏,9<k≤11为无油环与带油环凝析气藏过渡带
ϕ参数判别法	$ϕ = C 2 C 3 + C 1 + C 2 + C 3 + C 4 C 5 +$	凝析油气藏：7<ϕ≤15 带大油环凝析气藏：15<ϕ<60 带小油环凝析气藏：60≤ϕ≤80 无油环凝析气藏：80<ϕ<450
气油比法	气油比、油罐油密度	重质油藏：气油比<35、密度>0.966 g/cm³ 普通黑油油藏：气油比35~125、密度0.825~0.966 g/cm³ 黑油和挥发油过渡带：气油比125~350、密度0.802~0.825 g/cm³ 挥发性油藏：气油比350~625、密度0.760~0.802 g/cm³ 挥发油和凝析气过渡带：气油比625~1 425、密度0.760~0.802 g/cm³ 凝析气藏：气油比1 425~12 467、密度<0.760 g/cm³
相图判识法	温度、压力	油藏：地层温度<临界温度凝析气藏：临界温度<地层温度<临界凝析温度,地层压力>露点压力气藏：地层温度>临界凝析温度

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