The organic geochemical traits of Carboniferous to Permian hydrocarbon source rocks (SRs) from the Mahu Sag, Junggar basin, have been investigated in terms of thermal maturity (TM), hydrocarbon potential (HP), organic matter (OM) source input and paleoenvironment. A total of forty-seven (47) core samples from five (5) wells have been surveyed through standard organic geochemical approaches, including the total organic carbon (TOC) and the rock pyrolysis (RP) measurement. Fifteen (15) of the samples were bitumen extraction and fractionation, and their aliphatic hydrocarbons and aromatic hydrocarbons were carried out for the gas chromatography–mass spectrometry (GC-MS) analysis. The results indicate that the studied samples came from the C and the P₁f are the moderate or good SRs, but samples from the P₂w and P₁j are not good enough, most of them are poor or moderate SRs. The TM was indicated by the temperature of maximum pyrolysis yield (Tmax), the Carbon Preference Index (CPI) and Odd to Even Preference (OEP) values, the C₃₀ M/H versus Tm/Ts, the C₂₉ ββ/(ββ+αα) versus C₂₉ 20S/(20S + 20R), and the alkyl naphthalene ratios. Result shows that almost all the samples from the P₁f are in the mature stage at present; some samples of P₁j and C are in the premature or mature stage, others are completely immature; all P₂w samples are in the immature stage at present. The OM source was indicated by the n-Alkane distribution, the relative quantity of C₂₇–C₂₈–C₂₉ steranes, the (C₁₉+C₂₀)/C₂₃ tricyclic terpane (TT), and the Terrigenous/aquatic ratio (TAR). The deposition environment was inferred by the pristane/phytane (Pr/Ph), the Gammacerane index, and the relative quantity of fluorene compounds (Fls), dibenzothiophen compounds (DBTs) and dibenzofuran compounds (DBFs). Result shows that the mainly OM source of the P₂w, P₁f, P₁j, and C were the saline lacustrine algal, but some samples of the P₁j were mixed with the higher plants; most samples deposited in the strong reduction environment except the samples came from the P₂w and some samples came from the P₁j. Considering the OMs’ content, type, origination, deposited paleo-environment and TM, the SRs of the P₁f are considered the best sources rocks with the best conditions of the oil and gas generation.

从热成熟度（TM），烃势（HP），有机质（OM）来源输入和古环境等方面研究了准Jung尔盆地麻湖凹陷石炭系至二叠系烃源岩（SRs）的有机地球化学特征。通过标准的有机地球化学方法，对五（5）口井中的四十七（47）个岩心样品进行了调查，包括总有机碳（TOC）和岩石热解（RP）的测量。其中十五（15）个样品经过沥青萃取和分馏，然后将它们的脂族烃和芳族烃进行了气相色谱-质谱（GC-MS）分析。结果表明，研究样本来自C和P ₁ f。是中等或良好的SR，但来自P ₂ w和P ₁ j的样本不够好，它们中的大多数都是较差或中等的SR。Tm为表示通过热解最大产率的时间（Tmax），该碳偏好指数（CPI）和奇偶偏好（OEP）值时，C的温度₃₀ M / H相对于TM / TS中，C ₂₉ ββ/（ββ +αα）对C ₂₉ 20S /（20S + 20R）以及烷基萘比率。结果表明，目前几乎所有的P ₁ f样品都处于成熟阶段。P ₁ j和C的一些样品处于过早或成熟阶段，另一些则完全不成熟。全部P ₂ w目前样本还处于不成熟阶段。OM源由n-烷烃分布，C ₂₇ -C ₂₈ -C ₂₉甾烷的相对量，（C ₁₉ + C ₂₀）/ C ₂₃三环戊烷（TT）以及陆源/水生比（柏油）。沉积环境由rist烷/植烷（Pr / Ph），γ-甘油醚指数以及芴化合物（Fls），二苯并噻吩化合物（DBTs）和二苯并呋喃化合物（DBFs）的相对量来推断。结果表明，P ₂ w，P ₁ f，P ₁ j的主要OM源，和C是盐湖相藻类，但是P ₁ j的一些样品与高等植物混合。在强还原环境中沉积的大多数样品除样品来自P ₂ w和一些样品来自P ₁ j外。考虑到OM的含量，类型，成因，沉积古环境和TM，P ₁ f的SR被认为是具有最佳油气生成条件的最佳烃源岩。