川东南涪陵地区凉高山组凝析油气藏特征及成因

doi:10.7657/XJPG20220402

摘要/Abstract

摘要：

川东南涪陵地区下侏罗统凉高山组凝析气藏流体性质复杂,多井测试气油比差异大。利用原油色谱质谱、天然气组分、碳同位素、流体包裹体等资料,明确了原油及天然气基本特征,以天然气组分经验计算法及PVT流体相态模拟实验综合确定了气藏性质及相态。在此基础上,探讨凝析气藏特征及成因。结果表明,凉高山组天然气藏主要为无油环凝析气藏,原油及天然气以Ⅱ₂型干酪根成熟阶段生成的原生型凝析油气为主,局部地区可能存在原油裂解气。烃源岩热演化程度及现今压力系统的差异是造成油气藏性质差异的主要原因,成藏时期的相对深埋区与现今相对高压区的叠合区,是下一步勘探的有利目标。

关键词: 川东南, 涪陵地区, 凉高山组, 凝析油气成因, 天然气成藏, 成熟度

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

中图分类号:

TE112.111

李明阳, 黎承银, 屈大鹏. 川东南涪陵地区凉高山组凝析油气藏特征及成因[J]. 新疆石油地质, 2022, 43(4): 387-395.

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.

图/表 12

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凝析气藏相态类型判别方法及标准（据文献[9]和文献[10]修改）"

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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