Los Molles Formation (Lower to Middle Jurassic), deposited under the first marine event above the synrift continental deposits of the Precuyo, is the second most important source rock of the Neuquén Basin after Vaca Muerta Formation. Los Molles Formation extends over more than 45,000 km² and can be recognized in different geographic areas within the basin.

Los Molles Formation, with a thickness that varies from 100 to 800 m, has a total organic content (TOC) ranging from 1 to 5%, vitrinite reflectance (%Ro) 0.8 to 2, Hydrogen Index 300–500 mg HC/gTOC, SPI of 6 t HC/m², kerogen type II-III and a VKA of algal amorphous with variable terrestrial contribution. In the studied area, the unit is subdivided into three members, with different characteristics that reflect distinctive sedimentary environments from shallow marine to deltaic.

In addition to its condition of source rock, conventional and unconventional shale and tight reservoirs are currently being developed mainly within the vicinity of the depocenter of the basin, mostly related to gas prone basin centered gas systems. Volume estimation assigns 190 to 270 TCF of gas to this formation and 3.7 BBO.

Outcrops, three cores and fifteen wells with open hole logs consist of the database for this study. Deductive methodologies were used to characterize the formation with standard log analysis that consist of differentiating reservoir to non-reservoir rocks, sandstones, silt, tuff, clay, porosity, water saturation, permeability, TOC, Young's modulus, Poisson's ratio and brittleness index. Inductive methodologies (clustering) were used for determining electrofacies that correspond to: Sp, sand, medium to very coarse, may be pebbly, solitary or grouped; Sh, sand very fine to very coarse, may be pebbly, horizontal lamination; Fm, mud, silt, massive; and Gm, massive or crudely bedded gravel, horizontal bedding, imbrication.

The results of this study demonstrate the importance of taking advantage of different techniques when studying elements of the petroleum system related to Los Molles Formation.

Los Molles地层（下侏罗纪至中侏罗统）是沉积在Precuyo大陆同化沉积物上方的第一个海洋事件下，是继Vaca Muerta地层之后内乌肯盆地第二重要的烃源岩。Los Molles地层的范围超过45,000 km ²，可以在盆地内的不同地理区域中被发现。

Los Molles地层的厚度从100到800 m不等，总有机物含量（TOC）为1至5％，镜质体反射率（％Ro）为0.8至2，氢指数为300–500 mg HC / gTOC， SPI为6 t HC / m ²，干酪根类型为II-III，VKA为无定形藻类，具有不同的陆地分布。在研究区域中，该单元分为三个部分，具有不同的特征，可以反映从浅海到三角洲的独特沉积环境。

除了源岩条件外，目前正在开发的常规和非常规页岩和致密储层主要在盆地沉积中心附近，主要与以天然气易生盆地为中心的天然气系统有关。体积估算将190至270 TCF的气体分配给该地层，将3.7 BBO分配给该组。

带有裸眼测井的露头，三个岩心和十五口井由本研究的数据库组成。推导方法被用来通过标准测井分析来描述地层特征，包括区分储层与非储层岩石，砂岩，粉砂，凝灰岩，黏土，孔隙度，水饱和度，渗透率，TOC，杨氏模量，泊松比和脆性指数。感应方法（聚类）用于确定与以下物质相对应的电相：Sp，沙子，中等至非常粗糙，可能是卵石状，孤立或成组的；Sh，沙子非常细至非常粗糙，可能是卵石状的，水平层压的；Fm，泥，淤泥，块状；Gm，块状或粗糙的砾石，水平层理，胶结。

这项研究的结果表明，在研究与Los Molles地层有关的石油系统元素时，利用不同技术的重要性。